If you wish to join a team, you can do this on your registration page. 

In your participant email, there is a link to view your participant details (please be aware this link does expire after 20 minutes but you can always request a new one via the expired link).  

When viewing your participant summary, click the button to Join Team - as shown in the below image

If you cannot find your team, please contact support@registernow.com.au and we will be able to help you out.

If the option to join a team is not available this will be because the event is not taking team registration bookings. 

More Information on Participant Summary page - Click Here