Go to the Options tab (usually grey, with a picture of cogs or a wrench--but who knows, with all the updates) and click what is currently (Feb 4th 2012) the top left box, entitled "Options for changing your graphics settings." This tab allows you to mess with fullscreen, widescreen, brightness, and other graphics such as shadows and decorations.
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to change your stats on runescape all you have to do is level up.
There is no editor for Runescape. The only people that have the programs to edit or change Runescape is Jagex.
First go to the RuneScape Homepage and click Account Management under Account. Under Account Setting you will find Change password. Then Log in and change it.
You download a different source from a RuneScape private Server community
In varrock they let you change your clothes at the hair cuttery.