Locking your domains prevents changes from being made to domain contacts and name servers. Locking also prevents the domain name from being transferred to another registrar without your knowledge.
To Lock All Domains
Step 1: Sign in to your account.
Step 2: Select Manage Domains from the Domain Names drop-down menu.
Step 3: In the Manage Domains page, click Lock all Domains.
Step 4: Click OK in the Confirmation Message.
To Unlock Domains
Step 1: In the Manage Domains page, select the domain name(s) you wish to unlock and click Set Locking.
Step 2: In the Set Locking information pane, select Unlocked and click Save Changes.