Umm.. there is probally a thread about this already try and use the search button before posting and you will get on better.
The best way to do it is to upload to an image hosting website e.g. http://www.imageshack.us. Upload you're image there, then post a thread in Art/Textures with a clear title. Copy the URL of the image from the image hosting website and incase it in .
Umm..if you don't know how to post spinny heads, I would have a look for a tutorial on that. But its really just open you're head texturre in GIMP then go Filter - Render - Spinning Globe and save it as a .GIF.