Step 1: Make a decision:
1) should the new user be an administrator like you with publishing privileges?
2) should he/she be a group editor who can update content but not make it live?
We strongly recommend that you limit your admin role to one or two as gatekeepers so that someone always knows what’s going on with the site and can maintain a consistent voice and look — you would not want 4, 5, 6, etc. admins.
Step 2: Have your new user login to Drupal:
Login into Drupal -- this will add the new user to Drupal. The user can expect to be denied at this step.
Step 3: Find the person in Drupal and add them to the group:
While logged into Drupal, navigate to your "Group" tab. Select "Add People". From here, search on the person’s netID you wish to add. If they will be an administrator of the group's sites, you will check off the box for “administrator member”, then save. If the new user only has edit but not publish privileges, select no box and save.
Removing people from your group
While logged into Drupal, navigate to your "Group" tab. Select "People". From here you find the person's netID and delete them from the group.