Go to ‘My Memberships‘ at the top of the Page for the organizations.
Select the organization to go to the portal for that group.
Select People module within a portal. This is located in the left column of your group portal.
Select Invite People at the bottom of the page The following screen will appear.
Select what group you want new members to be added to in the drop down menu.
You can send a message with the invitation.
Enter emails for everyone you would like to invite and select Submit button.
Once an invite has been sent to a used, a reminder van be sent once every three days at the bottom of the page.