Nothing could be easier :)
- Once logged into your admin area, head to the "Groups" tab on the left of the screen.
- Click on the group you wish to associate a student with. Then, click on the "Users" tab at the top right of the table that appears.
- Here, click on the circle just to the left of "Not Associated" to see the list of users who don’t belong to this group.
- Find the e-mail address of the user you wish to add, then click "Associate" in the row of the user in question. There you go!