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