You can add people to a group from the Groups screen. When a group is selected the Add More People to Group option will display the Add Users panel allowing you to select and assign people.
Groups Screen.
Step 1. Make sure to start in the Organization Management screen.
Step 2. Click the Groups option to display the Groups screen and list all the groups in the organization.
Step 3. Click on the group you want to add users to.
Step 4. Click the Add More People to Group option to display the Add Users panel.
Add Users panel.
Step 5. If necessary, use the Search field to filter the list to the person or person’s you are looking for.
Step 6. Select a person or persons you want to add to the group. A checkmark will appear next to their name and they will be added to the list at the top.
Step 7. Click the Add option to add them to the group. You won’t have to update the group to save changes, added users will be automatically saved.