If your domain is registered with DigitalOcean, you can access your DNS Zone from your Control Panel → Networking tab.
You can find detailed tutorials on creating, editing, and deleting DNS records at DigitalOcean here: How to Create, Edit and Delete DNS Records.
Hostinger default DNS records:
If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact DigitalOcean directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊