Is there a way for the moderator to add members to a private group without sending an email?

Some of my invitees are having problems getting in after I invite them. One never receives the email invitation after several tries.

Is there a way for the moderator to add members to a private group without sending an email?
at the bottom of the invite page, there is a link to add members, only 10 per day :)





Oh, and it will send them a notice