Doubly Linked List question

Hello! what do i need to do to make those things work?. Maybe it's too hard to tell?

Prepend(value) : adds an element to the start of the list
Append(value) : adds an element to the end of the list
Clear()
PopFront()
PopBack()
PrintItems()

Here is the code

Source file http://hastebin.com/asalovixes.cpp
Header file http://hastebin.com/ugekixeniv.cpp

Thanks alot.

Best regards
Get out a piece of paper and a pencil.
Draw little boxes for nodes.
Draw arrow for pointers.
Draw step-by step how to do each thing without losing important arrows.
Taking the time to understand it is the basis of all tough questions.
Okay, thanks Duoas. I'm just stressed since i'm studying and have to learn c++ in really short time
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