Are you sure you have the latest version of the softroot? The first version I tried did not have adb over USB; it was over wifi. If you can get adb over USB, then you won't need to use wifilocker.
As for wifilocker, if the button says "Lock Wi-Fi", then wifi is currently not locked. If the button says "UnLock Wi-Fi", then wifi is currently locked. (i.e. the current state is the opposite of the button label.)
If your nook does not have adb over USB, and you want to use adb, first you'll have to use wifilocker to lock the wifi on and start adb. Then find your nook's IP address, and connect to it like this:
adb 192.168.0.1:5555
(But replace 192.168.0.1 with your nook's IP.)
Don't forget to unlock the wifi when you're done using adb, since it's a waste of battery.
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