Your Team Captain will be prompted to invite you during the registration process, so hold tight and wait for your invite to land in your inbox (remember to check your junk mail).
You will then need to click on the link provided and enter your details to complete your individual registration.
If you are already registered and need to join a team, please ask your Team Captain to invite you and wait for your invite to land in your inbox (remember to check your junk mail). Before you click on the link make sure you are logged in first and then click the link to join your team.
Please also see How do I form a team and add team members?