In orbot got to settings/onion services. Add a new service. Citrine uses port 4869. I set that for both ports. Name it whatever. Nostr worked for me 😂 You will need to restart orbot after you save. Then you can go back and copy your onion service address. Add ws://ONIONADDRESS:4869 as an outbox address in Amethyst. You may want to look into the whitelisting feature of citrine too. I set it to only keep notes that I post or refer to me. 😎👌