How to edit file jar , jad on server

[eluser]Unknown[/eluser]
[quote author="Bankzilla" date="1349060889"]Please provide more information, what you given I have no clue what you're needing help on or where you have even started.

If you have written anything and getting errors or having problems understanding something then please do post the code so we can help.[/quote]
I have no clue about problem , i need tutorial about problem ! can you help me !