To change the owner of a .es domain you just have to follow the following steps:
1. To change the data of the owner of a .es domain, go to the following address using your Nic-Handle and your password https://www.nic.es/sgnd/login.action?tipoContactoElegido=1&nivelDominio=2
2. In this section, you can specify the domain (it will automatically fill in the field of the current owner and the applicant), the owner and the new administrative contact person (PCA), present the captcha and click "Continue".
3. In the next step, you can sign the application using the DNIe or attach a photocopy of the DNI that you can upload directly (it does not have to exceed 600px in width if the attached problems try to reduce its size until accepted).
4. Nic.es will ask the current owner or the administrative contact for acceptance (send an email and have to access with their Nic-Handle to accept the process), once this is done, the request for change of ownership will be carried out, The quality Nic.es will review and if everything is correct, it will accept. The acceptance period is usually approximately 5-7 days, although there have been cases of transmissions in a few hours.
If the transfer is not accepted within 10 days, it is automatically canceled.
If you do not use the password associated with your Nic-Handle, you can recover it from the same link.
If you don't have a Nic-Handle for the new owner, you can create one from this URL https://www.nic.es/sgnd/contacto/publicAltaContactoInicializar.action
If you already have a .ES domain you already have a Nic-Handle, you can find it by performing a Whois on the domain
If we do not select ourselves (EDOMAINS) as Registrar Agent, the domain will be managed by Nic.es