To put a picture on your profile, go to support group options which is on the right hand side of the forums home page. There you will be able to upload an avatar to your profile.
Have you disabled your pop-up blocker when you attempt to change your profile? This could also be the problem with the Anxious Thoughts worksheet.
In your personal profile, try selecting that this information can be shown in your posts. Hopefully this will also allow you to make necessary changes to your profile.
Hopefully this will help! If you do experience further difficulties, please let us know via the feedback option.