The registration type page allows you to choose the type of registration and may contain.

- Participant Details

 - Create Team

 - Create Family

 - Create Group

More choices then appear based on your original choice.

To join an existing team / family / group, select the choice for "I'm a Participant" and then a secondary choice will appear as appropriate.
 - are you part of a team?   Yes / No (as shown below)*

This page may or may not be shown based on the setup details for the event*