The manager of your Team Plan should connect and activate your account through their dashboard. On your app, you can check if you've been activated, just click Menu --> Your Check-in Credits. If you see a plan on this screen and there are more than 0 check-ins left, it means that you're all set to start coworking!
If you see that 0 check-ins are left, it means that all of your team's check-ins have been used. In this case, you should reach out to the manager of your Team Plan and ask them to upgrade the plan. Alternatively, you can always drop a message to firstname.lastname@example.org and let me know!