Follow these instructions to add another person to help manage your Google business profile.
Step 1: Visit the following link and log into your Google Business Profile account
Step 2: Click "See your profile"
Step 3: Click on the three dots and select "Business Profile settings"
Step 4: Click on "People and access"
Step 5: Click "Add"
Step 6: Type in the person's email address and select Manager
(Important) Do not select Owner unless you intend on transferring ownership of the Google Business Profile to that person.
The person you have invited should receive an invitation email to start managing your profile. It is best to contact them as soon as possible to confirm they have received this invitation.