Select an object in your tree view (for example, Users or Groups).
Choose a specific object, for example, Engineering group.
Click the + sign next to the selected object in the tree view.
Go down the list and click Group Memberships. The group memberships dialog opens in your list view.
To add users to the group, choose a user from the Available Users list and click Add.
To remove a user from the the Group Members list, choose a user and click Remove.
Click Save to save your changes.