Once you have completed the TapNow tutorial in TapManager (iOS) or have installed the TapNow app on your device (Android) - follow the tutorial to learn how to wear and use Tap. At the end of the tutorial follow the instructions to add TapNow keyboard to your list of installed keyboards.
You can also navigate to your Settings > Apps > Select TapGenius/TapNow
Ensure the Bluetooth slider is ON:
Ensure TapNow and Allow Full Access are enabled: