Group administrators do not need to take any action to add members to their groups. Group members are added to your group based on the NROC Membership selection they make when they create an account at NROCnetwork.org.
However, it is possible to invite your staff to create an account and join your group.
From any page in your group, select "Send Invites" from the left navigation menu. From here, you can select people who already have an account at the NROC Network, or you can invite new users by email.