I have a subscriber who's signed up to a number of forms in the past but never clicked the confirm button in the incentive emails so they show as 'inactive'. Now I need to add them to a form for a course they're taking with me, but because they're inactive in the system they won't receive any emails I send to that form. How can I change their status? Or if they have to do it themselves how can I re-send them a link to click, as they no longer have the original incentive emails?