Adding a New Admin to Your Google My Business Page
1) Go to https://business.google.com/ page and click on the “Sign In” link and login using your appropriate Gmail login account.
2) Click on your location in the center list of businesses if you manage more than one.
3) Click on the “Users” tab in the left-hand column
4) Click new user icon in upper right corner of the popup window and then select “Invite New Users”.
6) Select the level of permissions you want to give to the new user and enter their Gmail address to add them as an invited user to the Google My Business listing.