You can add a photo to your profile in two ways: from your Dashboard at the top of the course site or from the Administration block on the left side.
Adding a photo from your Dashboard
1. Click on your account link visible at the top right side of the screen. Select "Profile."
2. Select Edit profile from the User details area of the My Account page.
3. Look for the User picture section, following the General information section. Upload your profile picture by clicking on the icon or dragging and dropping it onto the upload area. Generally profile pics are resized to be 100x100 pixels - so try to make your image close to that size.
OR watch this great video from a former FLO participant.