If your domain is registered with UOL, you can access your DNS Zone from your Domains → Your domains → Configure DNS Servers:

You can find detailed tutorials on creating, editing, and deleting DNS records at UOL here: I registered a domain with UOL HOST and I want to use other DNS servers, how do I do it?

Hostinger default DNS records:

If you face any difficulties while managing DNS Zone at your domain provider, it’s best to contact UOL directly. Alternatively, you can transfer your domain to Hostinger so your hosting and domain will be managed from one place 😊