You can update your name, display name and profile picture/avatar in the Profile section of the Settings page on the challenge website.

First, click on the "My Account > Settings" button in the top navigation.

Next, choose "Profile" from the options on the left.

Update your Name, Display Name (this is the name that other particpants in your challenge will see) and your profile picture/avatar. When you're finished, make sure to click on the "Update" button at the bottom of the page.

Open the left hand navigation and select "Settings > Profile"

Update your Name, Display Name (this is the name that other particpants in your challenge will see) and your profile picture/avatar. When you're finished, make sure to click on the "Save" button at the top right hand corner of the page.