thanks that helps. but i am wondering also is there a way to do it with out download anything. like some thing that i could do on the web
I may be wrong, but I don't know of any easy way to add a header and footer to your forums other than manually editing overall_header.tpl and overall_footer.tpl.
Instead of editing your local copy of overall_header.tpl and overall_footer.tpl and then uploading them to your server, you could edit your "live" copies of them right on your server, but you would be risking the "danger" of making a mistake on your "live" files while editing them.