For updating your *profile* picture (which is different than your avatar), these are the steps that need to be followed:
- Prepare the photo
- It must be at or less than 300x300 pixels in height and width
- Click "User CP" up in the green bar
- Click "Edit Profile Picture" on the left-side navigation
- Click "Choose File" under Option 2
- Find your picture and click Open
- Verify the photo is selected and click "Save Changes"
- Upon completion, you'll go back to the Edit Profile Picture page and your photo will be shown
I've also sent you a PM with my email address. Please send me a copy of the photo that you're trying to set.