Many domains (mostly ones that do not end .uk) can have a registrar lock set on the domain. This offers an extra layer of protection against transfers - in order to move a domain to another provider you need to turn off the registrar lock.
To turn on the registrar lock log in to your control panel and select Registered Domains from the homepage.
Select your domain from the list and the click Set Registrar Lock. (Please note that if this option isn't displayed then the domain registrar doesn't support the functionality).
If you wish to remove the registrar lock at a later date, simply return to this page and select Unset Registrar Lock.