After unboxing you BitLock, and setting up a new account on the BitLock app on your iPhone or Android phone, press either of the buttons ( circle or square) to see the blue LED start blinking.
Immediately after that you should a pop-up appear on your phone screen. Please answer "Yes" and follow the instructions to register your new BitLock.
Registration pop-up on iPhone
Registration pop-up on Android
After selecting "Yes", you will be asked to choose a name for your new baby BitLock, and select a combination code for times when your phone runs out of juice. For instruction on how to enter the combination code please read this article.
Press "Save" after choosing a name and combination code and you are ready to start BitLocking.