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In this menu you can create the users, that should have access to your account. To create a new user, click on the add-button. The username should be unique and somewhat descriptive to make management easier. To en- or deactivate the user, simply adapt the Status-switch. Under Group you can define to which usergroup the user belongs to.
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To save the user click on save. To edit or delete the user, click on the pencil button or the trashcan button.
This will create an empty row in the table, you can then click on the edit on the right as here:
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the two only required fields are the first 2:
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E-mail: provide an e-mail address that is connected to a Google Account (it might be a gmail account, but it can also be your company’s standard e-mail address if you have linked it with a Google Account).
The Group this user has access to.
The other fields can be filled, but are not required.
Pressing save will immediately give access (or change the access) of the user (no need to publish).