You can manage your DNS records via DNS Zone Editor. To reach it, go to the Domains section and click on the domain for which you want to change nameservers:

You can change NS records by clicking on Change on the overview page:

If you want your domain to point to Hostinger via Nameservers, just choose "Use Hostinger nameservers (recommended)":

If you want to use external nameservers, click on "Use my own nameservers" and insert the values:

Click Save - and changes will be successfully implemented.

NOTES:

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