Adding

Go to a logo of the size you want, right click, select Properties, copy the URL given, then go to the Forum signature function, click on the tree, and put the URL in the right place when prompted to do so.   I add this information because I have been trying to place a correctly-sized nice quality copy of "Butt Naked" to my signature and have been striking out constantly. What I finally did was find another person who had reached the "Butt Naked" level and had the type of logo I wanted, placed the cursor over the logo, right-clicked over it and got the URL. That way, it worked.