Go to the User Control Panel : ucp.php
Click the Profile tab, select Edit Avatar.
You can then upload a picture, but the maximum dimensions are 160 x 160 pixels, so you may need to shrink or crop the image beforehand.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"You've got to focus on what's really worthwhile in life, which means resisting a lot of the currents in our culture" (Thanissaro)