I don’t see the setting for this (the ln address). Maybe I don’t have the right version of the app 

 Settings (3 bars in top left corner)
Click advanced 
Click Lightning box 

 

 This is what I see in advanced https://i.nostr.build/n7MDjHiaNyXh1s05.jpg  

 What version you running and ios or android? 

 Testflight 0.6.9 (63) on iOS 

 0.6.9-420 

 Is your channel officially open in blixt? 

 Yes. I sent some sats back to Phoenix via lightning 

 Is there a gear in the top right corner? Click and scroll down to "Experiments" 

 Maybe it’s only on android for now?