Perform a Search for People.
Select the person or persons you wish to invite to join
your group, right-click and select Invite in current group
from the contextual menu.
The Invite others to current group dialog box appears.
In the Topic text-entry field, enter the topic
or message of your invitation and press the Send button.
The invitation is sent to the designated person or people.
Those people will now respond to your invitation.
You will receive their responses in the Invitation response