Clicking the "Add to your network" link takes you to the page shown below where you have a few choices:
Group: This dropdown box allows you to choose which of your groups you want this person to be added to if they join your network. The next slide will give more information about groups.
Message: Any text you enter in this area will be sent to the person that you are inviting to your network. You can leave this area blank if you want.
Zoints Code: Once in awhile, someone will give you a "Zoints Code". If you are given one and enter it, you are automatically networked with that person. They do not have to approve your request.