What do you mean by "lock" it? Do you mean encrypting the connection so no one can access your routers wireless signal?

You don't need Network Magic to do that. Just look for the security or encryption section of your router's settings. There, you can set your password and authentication type. Just don't use WEP, it can be hacked in under a minute, from what I've heard. WPA would work fine.

Borgslayer