Prepare your question. Think it through. Hasty-sounding questions get hasty answers or none at all.
Write in clear, grammatical, correctly-spelled language
Expressing your question clearly and well is important. Spend the extra effort to polish your language. It doesn't have to be stiff or formal. But it has to be precise.
If you write like a semi-literate boob you will very likely be ignored. So don't use instant-messaging shortcuts.
Be precise and informative about your problem
•Describe the symptoms of your problem carefully and clearly.
•Describe the environment in which it occurs (machine, OS, application, whatever).
•Describe the research you did to try and understand the problem before you asked the question.
•Describe the diagnostic steps you took to try and pin down the problem yourself before you asked the question.