During registration, your teammates can join your team.
Although your friends have joined your team, in order for you and others to see your teammates on your team supporter page, your teammates will need to activate their supporter page & join it to your team page.
Your teammates will be emailed a page activation link after registration. They will simply need to click on the link to activate their page and they should then show on your team page.
If you do require further information on how to join an individual supporter page to a team page click here