If your domain is registered with Google, you can access your DNS Zone by logging in to Google Domains here and navigating to your Menu → DNS.
You can find detailed tutorials on creating, editing, and deleting DNS records at Google here:
Hostinger default DNS records:
If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact Google directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊