If you’re an Administrator or Network Creator, you can resend invitations to potential members on your Ning Network if they don’t receive or respond to the initial invitation. Just go to the My Network tab and click on “Moderation” under the Members section. Click on the Invited tab. Check the boxes next to the people you’d like to re-invite to join your network and select “Resend Invitation” from the drop-down menu.
Sometimes messages from the network can get caught in spam filters. If your potential members don’t see the invitation in their email, have them refer to the troubleshooting guide for possible causes and resolutions.