Administrators view on the bottom of the Admin Panel allows adding and deleting administrator rights to the users.
Administrators can be added after clicking on the plus icon in the top right corner of the Administrators view.
Email address is the only field that is available in the dialog. After providing an email and confirming the save action, provided user should be able to access and use the Admin Panel.
Administrator rights can be taken away after clicking on the trash icon that appears after putting mouse over one of the rows with administrators. Please note, that it is impossible to take away the rights from current user.