@chippom To set nameservers you’ll need to transfer your domain to name.com
See:
There is more explanation here:
https://answers.netlify.com/t/support-guide-how-do-i-transfer-my-domain-name-to-or-away-from-netlify/186#p-356-can-i-transfer-them-to-another-person-or-registrar-4
You should submit a support ticket to Netlify Support