Before you can transfer a domain to Yahoo!, you'll need to be sure that your domain is unlocked. (If your domain is locked, your registrar will reject the transfer.)
To unlock your domain, you'll need to contact your registrar. Many registrars will make tools available for you to unlock your domain yourself; or contact your registrar directly for assistance.
Tip: Don't remember which registrar you used? Look it up.
Every domain transferred to Yahoo!, and most domains registered through Yahoo!, are locked automatically. When you manage your domain with Yahoo!, you can unlock and relock your domain anytime on your Domain Control Panel. See details.