Settings > NWC, create connection and copy it. In Amethyst long press zap icon then paste and save.

Requires push notifications to work on your device so that minibits can wake up on incoming encrypted nwc command. 

 They did it! Thank you.

It's the long-press zap icon in Amethyst that throws people off. That's a good place to put the NWC settings, but most people are going to be looking in Amethyst settings.