Go into the User Control Panel (look under the Dhamma Wheel masthead) Choose profile from the tabs Edit avatar.
Your target image should be no more than 160 x 160 pixels. Free picture resizing applications are available on the Internet if you wish to resize a particular image.
"Only those who take to meditation with good intentions can be assured of success. With the development of the purity and the power of the mind backed by the insight into the ultimate truth of nature, one might be able to do a lot of things in the right direction for the benefit of mankind."