Hi mxgirl,
You would contact
support@lunarpages.com if you want your domain to be locked. Unfortunately, OpenSRS management doesn't allow domain locking at the user level, so only we can do that for you. Simply provide your account username and the last 4 digits of your card on file. We do not charge for locking it for you.
Next, if you want to purchase a domain name that is no longer registered by anyone, simply state that in the same email to support along with authorization to charge it to your card and the domain name you are wanting to buy.
Thanks.