Sync Campaigns contacts to CRM

Sync Campaigns contacts to CRM

Trying to set up sync from Campaigns to CRM. Options there appear to be triggered when someone has "clicked" or "opened" (presumably an email from a campaign). I want to sync all the contacts who have signed up for a mailing list via a signup form and double opted in. Perhaps you are counting the double optin as a click? How do I sync all confirmed registrants on a list (whether or not they have clicked/opened an email campaign)?