Ok got it. So it's 2 different settings. In Damus to edit your receiving address you go to your profile and tap "edit" and then change your "Bitcoin Lightning Tips" address to a Lightning address that can receive zaps. See the screenshots below. 

For sending, if you want one-tap zaps  in Damus then you would use the Alby or Mutiny NWC option (which is the screenshot you posted above). In order to use that you have to go to Alby or Mutiny settings and generate a NWC connect string for Damus, and then paste it in there and save it. Once you do that, double check that Damus didn't overwrite your receive address because it does that sometimes when you change the NWC settings. 

If you don't care about sending with one-tap zaps in Damus, then just go into your app settings menu and select a default wallet. Then when you zap someone it will open up that wallet app for you to confirm the send. 


https://image.nostr.build/780ecdadf9a5d2b1ba2aab82f0cfffb887ed69c853e8f81593d94fe0f8ad33b5.jpg
https://image.nostr.build/32798028ca2bcacbf0daf4b76bd1867731a2d50e06778e9db42c476ebd45863e.jpg