Our coach is registered and plays with an adult team. Does he/she have to send in another registration form and pay the membership fee again?

NO. Once someone is registered as a member with the Region in whatever capacity for the current season, then they do not have to register again to coach a team. Just add them to the Team Registration Form with a notation that they are already a member and have them log in to their member record to submit the Junior Club Personnel Code of Conduct Form and Background Screen permission form (with $18.00 if applicable). They also must be IMPACT/SafeSport certified to coach a Junior team.