to post an avatar:

1. right click the picture you want.
2. click the save as, to load it on your computer.
3. go to User CP
4. click edit signature.
5. use option 2 upload from your computer. browse and find the file and the picture you want to use. ( must be no bigger than 80 x 80 pixels)
6. upload.
7. click the save signature button.