You can register a new team through the frontend of the thon website. You can also register a team if you are the client through the backend (Bookkeeping). Here is how to do it.
1. Communities > Special Events > Friends Asking Friends > Kintera Thon > 2. Hover over your event name and click Bookkeeping 3. Click Registration Entry 4. Search for the team captain record in sphere and click the radio button next to the name. 5. OR click New if there is no existing record for the team captain. 6. Select the Start a Team radio button 7. Select whether its an Independent Team or a team under a Group/Company 8. Enter Team Name and Submit 9. Enter Team Captain info if its a new record 10. Select Fee and other required options > Click Submit