[NTLDR]

Into which directory have you put icon0.gif into? It should be in { imagesfolder }/icons/ where { imagesfolder } is the directory where your images are, like the user cp, member list buttons etc are.

If your using the defualt template this will be forumurl/images (forumurl is the url to your forum directory)

If you don't know where { imagesfolder } is:

In the Admin CP, click styles, Modify, select fonts colours ect for the style you are using.

Find the Image Path section and the image folder path that is entered in the textbox there will point you to your { imagesfolder }

Let me know if this works or not.