When your colleague or manager decides to start using Metatask for your team, first of all, you get the email with the heading "[Colleague's name] invited you to join [Team's name] on Metatask".
This email contains the button "Join your team" which redirects you to Metatask sign-up page.
When you press the button "Join your team", you're redirected to sign up page, where you should enter your first and last name, and create a password for your account.
As soon as you press "Complete registration", you can start using Metatask. You also get the confirmation email that you have joined the team. It again contains your team's name and URL address.
Now you can view your tasks and work on them. Welcome to Metatask! 🙂