Currently, it's only managers that invite and remove team members. Team members can still invite, but a team manager has to approve before access is granted.
Go to "Settings"
Go to Members
Here is the overview of the members in your team.
To add more users, click "Invite users", write in their email, then customize which features new member(s) can access.
If you want to add several people at the same time, you can add all the emails into the same field as long as they are separated by a comma.
The trashcan symbol removes people from your team.