You will create, update, and manage your teams on the Teams page.
How to add new members?
At the end of each team row:
you will press on the three dots
you will select the option - Details
From here, a new section will open where you can easily add members.
By clicking Add member, you will be able to fill in the email address of the person joining your team and select what type of member it will be (guest, user, admin).