You will be presented with a table screen recording your colleagues' names. If it is still empty, look for a button labeled "Add Colleague / Invite User" at the top corner to invite a friend.
Fill in the blank column labeled Email Address, and one optional input Temporary Password into it.
At the bottom of that box, click and select a rank option (Role). You can give them the degree "As Admin" (the boss) or just the option "As CS".
Finally, press Send Invite / Save on the bottom edge button.