If your domains is registered with Google Domains, good job! We're big fans of Google Domains for three reasons:
It doesn't try to sell you on additional add-ons. Privacy settings are built-in!
To share management of your domain with StoragePug:
Select the name of your domain.
Click Registration settings.
Under "Domain permissions," click Add user.
Enter the email address: email@example.com
Confirm you added the user.
Once you complete step 7, StoragePug will receive an email notification with a link to log into Google Domains.
Here's a screenshot of what the Domain permissions screen looks like on Google Domains: