Why is My Form Not an Option for an Event Registration?

If you do not see the form you created within your event registration's Detail Collection Form section, it is not assigned to the correct form type.

1. Access: Components>Form Manager>Build/Edit (Layouts). 
2. Locate your form and click the 'Edit' button.
3. On the Details tab, change the Layout is Used For drop-down to Event Registrations. The form will now become an available option.