It's pretty self-explanatory... is the image you're using too big or in a mode the browsers won't read like CMYK?
Make the user image about 150-200 pixels square is a nice safe size.
Where exactly is it giving you trouble?
Thanks for the reply. Every time I selected the link to change my photo, the upload a photo option never appeared. I'm now using a different computer and the option is available, so I've uploaded a new pic. I guess it was just some sort of weird technical glitch.
This site is reeeeally heavily flash and css-oriented, so it could be the computer you were originally using has some blocker in place that's stopping the dynamic menus from popping up.