To add a member to your team, click on your name in the upper right corner of your screen to see more options in the drop-down menu and then click „Team management“:
In the box „Email“ write in the email of your team member:
Choose whether you want to send them „Find Credits“ or „Verify Credits“ and the amount of the credits you want to send them. Then click Send Credits. Voila!
They become Team members and they get their credits each billing cycle.