Instructions
Power on your Xbox console and allow it to load your dashboard. Sign in to Xbox Live from the dashboard to begin editing your bio and other profile details.
Scroll to the "My Xbox" section on your console's dashboard and press the "A" button while highlighting your gamercard (after logging in to your Xbox Live name).
Click "Edit Profile" and choose "Bio." A window will appear to begin typing your biography and details about yourself.
Use the on-screen keyboard with your controller (by pressing "A") to type what you would like and click "Continue" to save the new settings to your profile.