So close to being finished, SO STUCK

So I have a project due tuesday, it didn't seem too difficult, but when I sent my teacher my errors which are as follows
In file included from indexList.h:78,
from indexListApp.cpp:9:
*indexList.cpp:33: error: ISO C++ forbids declaration of `operator=' with no type*
indexList.cpp:33: error: prototype for `int indexList<T>::operator=(const indexList<T>&)' does not match any in class `indexList<T>'
indexList.h:28: error: candidate is: indexList<T>& indexList<T>::operator=(const indexList<T>&)
indexList.cpp:33: error: template definition of non-template `int indexList<T>::operator=(const indexList<T>&)'

She then replied

The prototype for the operator= is wrong. There should not be a T before the indexList on the return type

I've e-mailed her back but she has stopped replying, I don't know if anyone here will understand what she meant, as far as I can tell the operator= is right, it says there shouldn't be a T before the indexList on the return type, so I removed a T that was in front of the assignment operator overloader function. Removing that T creating the error with * * on either both sides of it, with the T there, the * * error doesn't appear

This is my header file
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#include <iostream>
using namespace std;


#ifndef INDEXLIST_H
#define INDEXLIST_H

template <class T>
class indexList
{
 public:
  indexList(int size = 10);
  indexList(const indexList &rhs);

  ~indexList();

  indexList &operator=(const indexList &rhs);

  //Adds element to the end of the list
  //If array is full, returns false
  bool append(T value);

  //Inserts an element at index indx, if indx valid
  //moves values up before inserting
  //If indx is invalid, returns false
  bool insert(int indx, T value);

  //Replaces the value at indx if indx is valid
  //IF indx is not value, returns false
  bool replace(int indx, T newValue);

  //Removes a value from a specific indx, if indx valid
  //remaining values are moved down
  //IF indx not valid, return false
  bool remove(int indx);

  //Searchs for the value in the array
  //Returns indx if found, -1 if not found
  int search(T value) const;

  //getSize
  //Returns the number of elements currently in
  //the array
  int getSize() const;

 private:
  T *list;
  int numberOfElements;
  int maxSize;
};

//<< stream operator will write out the entire list
template <class T>
ostream &operator<<(ostream &outStream, const indexList<T> &lst);

#include "indexList.cpp"
#endif


And this is the implementation file

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#include "indexList.h"
#include <iostream>
using namespace std;

  //constuctor:
template <class T>
indexList<T>::indexList(int size)
{
  numberOfElements = 0;
  maxSize = size;
  list = new T[maxSize];
}

//copy constructor
template <class T>
indexList<T>::indexList(const indexList& rhs)
{
  maxSize = rhs.maxSize;
  numberOfElements = rhs.numberOfElements;
  list = new T[maxSize];
  *this = rhs; //creates deep copy
}

//overloading assignment operator
template <class T>
indexList<T>::operator=(const indexList& rhs)
{
  if (this != &rhs);
  {
    maxSize = rhs.maxSize;
    numberOfElements = rhs.numberOfElements;
    delete[]list;
    list = new T[maxSize];
    for(int i = 0; i < maxSize; i++)
      {
        list[i] = rhs.List[i];
      }
    return *this;
  }
}
template <class T>
indexList<T>::~indexList()
{
  delete list;
}

//append
  //Adds element to the end of the list
  //If array is full, returns false
template <class T>
bool indexList<T>::append(T value)
{
  if (maxSize > numberOfElements)
    {
      list[numberOfElements] = value;
      numberOfElements ++;
      return true;
    }
  else
    return false;
}


  //insert
  //Inserts an element at index indx, if indx valid
  //moves values up before inserting
  //If indx is invalid, returns false
template <class T>
bool indexList<T>::insert(int indx, T value)
{
  if (indx >= 0 && indx < numberOfElements && numberOfElements < maxSize)
    {
      for (int i=numberOfElements; i>indx; i--)
        list[i] = list[i-1];
      list[indx] = value;

      numberOfElements ++;
      return true;
    }
  else
    return false;
}

  //replace
 //Replaces the value at indx if indx is valid
  //IF indx is not value, returns false
template <class T>
bool indexList<T>::replace(int indx, T newValue)
{
  if (indx >= 0 && indx <numberOfElements)
    {
      list[indx] = newValue;
      return true;
    }
  else
    return false;
}


  //retrieve
  //Retrieves the value at index indx, if indx valid
  //If indx is not valid, returns false
template <class T>
bool indexList<T>::retrieve(int indx, T &value) const
{
  if (indx >= 0 && indx < numberOfElements)
    {
      value = list[indx];
      return true;
    }
  else
    return false;
}


  //remove
  //Removes a value from a specific indx, if indx valid
  //remaining values are moved down
  //IF indx not valid, return false
template <class T>
bool indexList<T>::remove(int indx)
{
  if (indx >= 0 && indx < numberOfElements)
    {
      for (int i= indx; i < numberOfElements-1; i++)
          list[i] = list[i+1];

      numberOfElements --;
 return true;
    }
  else
    return false;
}

  //search
  //Searchs for the value in the array
  //Returns indx if found, -1 if not found
template <class T>
int indexList<T>::search(T value) const
{
  for (int i=0; i<numberOfElements; i++)
    {
      if (list[i] == value)
        return i;
    }
  return -1;
}


  //getSize
  //Returns the number of elements currently in
  //the array
template <class T>
int indexList<T>::getSize() const
{
  return numberOfElements;
}


//<< stream operator writes out entire list
template <class T>
ostream &operator<<(ostream &out, const indexList<T> &lst)
{
  T element;
  int count = lst.getSize();

  for (int j=0; j<count; j++)
    {
      lst.retrieve(j, element);
      out << "[" << j << "] " << element << endl;
    }
  return out;
}


If anyone has any idea, I would greatly appreciate it!
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//overloading assignment operator
template <class T>
//indexList<T>::operator=(const indexList& rhs)
indexList<T>& indexList<T>::operator= ( const indexList<T>& rhs )
{
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