Anti-theft set up in NMS lite app for Android

I have downloaded the free NMS lite app from Android Market to my Galaxy tab (Android version 3.1). I can not do the settings for anti-theft. When I click the bar for "set anti-theft", it just shows an information message. I have registered on the web page, but there I get a message that I don't have any subscription, and I'm being asked for a product key.

 

Can someone help me get this working, step by step? Have tried to uninstall and reinstall the app, but the same happens.