By visiting the Contacts section of Demio, you'll be able to see every Registrant that has ever registered for one of your webinars:
You can search for an individual contact by name or email. Just start typing and recommendations will appear below:
Once you find the contact that you're searching for, just click on that Contact's name to visit their profile page:
Here, you can see a Contact's upcoming webinars, as well as a history of the past events that he/she has attended.
If the contact has an upcoming event, you can click on the link to find that contact's join link OR to resend the confirmation email:
By clicking on 'Resend Confirmation,' this Registrant will receive another confirmation email with their join link for the specified webinar.