Credits to Easy Review for sharing these instructions
For Businesses with a Single Listing at a Single Location
Step 1 > Visit this URL and log in to the Google Account associated with your listing: https://www.google.com/business/.
Step 2 > Click Users from the menu on the left sidebar.
Step 3 > In the top right corner of the “Managers permissions” box that appears, click (Invite new users) icon.
Step 4 > Type in an email address
business@ordersai.com
Under “Choose a role”, select Manager or Owner. Then press the INVITE button.
Step 5 > Once you see the Manage permissions screen, press the DONE link.
Step 6 > Success! This will allow us to manage your Google My Business listing. Note that you can revoke this access at any time.
For Businesses with Multiple Locations or Multiple Listings at a Single Location
Step 1 > Visit this URL and log in to the Google Account associated with your listing: https://www.google.com/business/.
Step 2 > Make sure you’re using card view. If you’re viewing your locations as a list instead of cards, switch to card view by clicking the cards icon on the right side above your list of locations.
Step 3 > Under Locations, choose the listing you’d like to allow us to manage and click MANAGE LOCATION.
Step 4 > Click Users from the menu on the left sidebar.
Step 5 > In the top right corner of the “Managers permissions” box that appears, click (Invite new users) icon.
Step 6 > Enter the following email address: business@ordersai.com and under “Choose a role”, select Manager or Owner. Then press the INVITE button.
Step 7 > Once you see the Manage permissions screen, press the DONE link.
Step 8 > Success! This will allow us to manage your Google My Business listing. Note that you can revoke this access at any time.
Step 9 > Please repeat the above Steps 3 to 8 for all Locations that you would like to allow us to manage.