Tell me a bit more about your experience. What happens when you try to update your profile? Do you get an error message? Please attach a screen shot of what you see and I will pass it along to our tech team. Thanks.
If you go to your Bio page, on the right hand side you will see a list titled "Actions". In that list there is an option to edit profile and should be able to do it from there. I had trouble with adding multiple activites. I figured out that if you hold down the control button and click on the activities you can add all that you like. I uploaded a picture from my own picture library as an avatar. It does not show up on the profile page but does in other areas such as the forums. Good luck.