If your domain is registered with Namecheap, you can access your DNS Zone by navigating to your Domain list and clicking Manage button:
You can find detailed tutorials on creating, editing, and deleting DNS records at Namecheap here: How to Change DNS For a Domain.
Hostinger default DNS records:
If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact Namecheap directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊