To add a new administrator, you must "Invite an administrator" by sending him a special email to the email address, following the link in which he can log in.
Open the Settings / Administrators tab in the side menu.
2. In the window that opens, click on the button “Invite admin”
3. In the window that opens, enter in the email administrator and click on the button “Invite”
4. Open the letter in the mailbox, click on the link indicated in the letter