If your domain is registered with Network Solutions, you can access your DNS Zone by logging in to your account here and selecting My Domain Names → Manage → Change Where Domain Points → Advanced DNS.
You can find detailed tutorials on creating, editing, and deleting DNS records at Network Solutions here: How Do I Manage Advanced DNS Records?
Hostinger default DNS records:
If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact Network Solutions directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊