1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon  
  2. Hover over your event's name and select Bookkeeping
  3. Click Manage Initiative Records
  4. Search for the participant who would like to become a team captain of an existing team
  5. Click Edit beside their name
  6. Navigate to the Event Registration Information tab
  7. Click Become a Team Captain of an Existing Team
  8. Mark the radio button next to the Team desired
  9. Click Save on the participant page when finished