go to:
My Controls/Edit Avatar Settings/
then either choose one of the predifined avatars or upload your own.
if you upload your own, make sure you get the dimensions right,
max. is 125 x 125 pixles. if your picture is bigger the BBS will shrink it,
be sure you specify the correct aspect ratio in that case.
also note that if you use a much bigger picture, we all will still have to download all that pretty image data, even tho it'll be displayed as a tiny image.
so, do as all a favor and shrink your avatar to the correct size before you upload it.
Andy