You can choose one of the two ways to invite team members. First one is an email invitation. To do that all you need is to enter your colleague's email and hit Send. The email with the invitation link will be sent and in a moment your team will be complete. You can send email invitations to up to 5 people at once.
Another way to invite members is sharing the invitation link on your own. This may come in particularly handy if you want to invite multiple users via your favourite communication app be it MS Teams or Slack.