If your domain name is registered with Google Domains, please follow these steps to update your nameservers:
Sign in to Google Domains
Select the name of your domain
In the top-left menu, click DNS
Under Name servers, select Use custom name servers
Enter the exact nameservers that you have received in your email
Click Save to save your changes
Please note: If you haven't added custom name servers before, click Switch to these settings.
Your nameservers update will be processed within 3-6 hours. However, it may take up to 72 hours for it to be visible everywhere.