1. Underneath your enrollment on the right hand side of the screen, press Manage Students

2. At the top of the Manage Students page are two choices, Add Student and Add Multiple Students

If you choose Add Student you will be prompted to add the student's information, including a profile picture or cartoon avatar

If you choose Add Multiple Students you will be prompted to add information for multiple students at once, however you will not be able to set profile pictures or avatars for each of them at the same time