you can go to overlay layouts section and edit the codes of premade overlays there..
but if u want to make ur own..
start here

[url]http://theftalk.com/t2458-%5BTUTORIAL%5D-Making-Overlay-easy-way%21.html[/url]
or here

[url]http://theftalk.com/t7817-make-overlay-profile-using-downloading-prog.-%28table-ed.%29.html[/url]