If you are looking for a banner sig like mine, find one that allows you to click on it, then fill out the information that pertains to you, then it will give you codes, copy the one made for forums. Then go to settings at the top of the page, there will be edit signature, click that then paste your info into the box. That is it, you may have tried this earlier and didn't see it because you have to have at least 15 posts to have a signature.
For the fsusa junkie banner, ask on the fsusa forum and someone should be able to give you the banner code for it.
Hope this helps both of you.