The tags column shows what tags a guest belongs to. By default, all confirmed and waitlisted guests are tagged with the registration button they used to sign up for the event.
If you click the tag icon that corresponds with a guest's name, the UPDATE GUEST REGISTRATION window will appear. If your event has multiple registration options with more than one registration button, you can use this tool to assign them to a new registration button, with or without sending them a new confirmation email.
You can also re-send them the confirmation email by maintaining the current selection, then clicking UPDATE AND SEND CONFIRMATION EMAIL.
ZenGRM