How to add an icon to SexyBookMarks???

Hello I have an adult social bookmarking site and a few wordpress blogs.

I have searched the whole internet for this but can’t find anything…

I would like to manually add an icon for my Adult social bookmarking site (bigt.it) to the SexyBookmarks Plugin.

I already edited the Custom Sprite PNG file but that didn’t do anything. I tried doing the manual CSS override but that just shows .- for everything and no images which is not what I want.

So if you could please help me, it would be so so much appreciated

Thanks,
Jim