Go to domains.google.com, select your desired domain from the right-hand side under “My Domains”. You’ll see the domain under “Name” click on the domain name.
Go to the left-hand bar, if it’s not there, click on the hamburger menu at the top left to open it.
From the left-hand sidebar select, “Registration Settings”.
On the Permissions box on the right-hand side, click on the blue text link that says “Permissions”
Once you’ve clicked on it, you’ll see a field to add an email address, right next to it you’ll see the permission type, in my case it says “with full permissions” and at the far right you see a button that says “Add”.
Once you’ve typed in the email address, click on the “Add” button and now you have a new user that can edit the DNS for your Google Domain.
Below the email address field, you’ll see what other users already have access to that particular Google Domain, with what specific permission type. At the far right, there’s a delete if you desire to delete that user.
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