1.Iniciar sesión into tu/tus/su/sus account y on the dominio name in "Mis Productoos"
2.Click on the dominio name you would like to edit
3.Click Dominio Services on the left
4.Enter tu/tus/su/sus desired name servers y save
Note: Nombreserver Update Failed o Rejected
Si you see "Nombreserver update rejected" o "failed" after update tu/tus/su/sus nameservers , the registry may have rejected the nameservers because tu/tus/su/sus nameservers do not meet registry's technical validation requirements. This is usually related to DNS configuration issues, such as the nameservers not being properly configured, not responding corectly, o not set up as authoitative.
Please contact tu/tus/su/sus DNS/hosting provider to ensure the nameservers are corectly set up y publicly resolvable.
Once they are valid, you may try updating them again.