If your domain is registered with Dreamhost, you can access your DNS Zone from your Manage domains → DNS tab.
You can find detailed tutorials on creating, editing, and deleting DNS records at Dreamhost here: How do I add custom DNS records?
Hostinger default DNS records:
If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact Dreamhost directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊