By requesting a Domain Lock, it will be impossible for third parties to transfer your domain elsewhere. This will prevent your domain from being hijacked. We would advise you to use a Domain Lock where possible.
To request a Domain Lock from your Control Panel, go to Domain & Hosting and click on the domain name. Scroll down to the 'Transferlock' header on the right. You can then switch the Lock on or off by clicking the ‘Enable/Disable’ button on the right-hand side.
The following domains support Domain Locking: .com .net .org .info .biz .name .be .ag .bz .cc .in .la .pl .sc .tk .tv .tw .us and .mobi.