Forum:Style Sheet or Template?

I'm trying to reset my style sheet or template. Upon creation of the wiki account.. you offered a small selection of templates to use as your main page lay out.. I've selected a dark gray back ground, which at first I thought would be acceptable, But now I've changed my mind.. How can I reset or change the whole page's design or even delete the page/wiki all together?


 * You can use the theme designer to change the look of your wiki at any time, and you can browse Templates Wiki for some other templates.