How to Add people to your group directly
When you add people directly, you can assign them the member and manager role.
Sign in to Google Groups.
Click the name of a group.
On left side - Click on Members
Click Add members
Choose if you want the person to be a Manager (they can add, delete users) or if you want them to be a member. Enter the email address (under the correct choice) of the person to invite.
(Optional) To add a welcome message to the email notification for new members, enter a message.
Leave the Subscription - Each email
Leave the default - Directly add members (on)
Click Add members.