-Sign in to your Google My Business account.
-If you have multiple locations in your account, open the location you'd like to manage.
-On the left hand menu, click Users.
-A small window will open up on the screen
-On the top right hand side of this window click on the add users icon 
-Another small window will open up with an option to type in an email id and select a Role for the new user you want to invite to manage your listing
-Enter the name or email address of the user you'd like to add. Note: If you're adding an agency to your location, you'll need to add the agency's location group ID here. (You may need to reach out to the agency and ask for this ID.)
-To select the user's role, click Choose a role and then Owner, Manager, or Site manager.(We suggest selecting the role as a Manager)
-Click Invite. Invitees will have the option to accept the invitation and immediately become users.