As an administrator, you are able to add or remove group members. If the group is private, members can only be added by administrators.
Add a Member into a Group
Click Groups or the People icon on the left menu.
Click View on the group where you would like to add the member.
Click the Members tab.
Click the Add Another Member button.
Enter the name or email address of the member in the Lookup box.
Select the member and click Save.
Remove a Member from a Group
Click Groups or the People icon on the left menu.
Click View for the group where you would like to remove the member from.
Click the Members tab.
Find the member in the list and click Remove.
Click OK in the browser pop up to confirm the change.
When adding or removing members in a group, if the group email notifications are turned on, the member will receive the associated welcome and farewell emails.