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.

😎👌