How to "move" a speaker in the iOS app?

I've combed through piles of questions and answers here, but I don't see answers to the seemingly simple issue of moving a speaker from one room to another within the app. My specific situation: I have a Play 5 and a Play 1 in the same physical room (my living room), but they are currently in different "rooms" when viewed in the app. I want both speakers to be in the same physical room and the same "room" within the app. How do I do this?

If you're reading this Sonos Team, your onboarding sequence is absolutely maddening. Here's what it looked like for me:

1) Got a Play 5. Got it set up no problem. Woo!
2) Weeks later, I got a Play 1. The plan is to add this speaker to the same physical room as the Play 5.
3) Earlier tonight I unboxed and ran the setup sequence on iOS to add the Play 1.
4) It gets to the point where it asks me to choose a room for the Play 1. I can't remember what room name the Play 5 is assigned to, so I make a guess about which room to add the Play 1 to. (I assumed this would be a snap to correct later if I make a mistake. I assumed wrong.) It turned out that I remembered wrong on the room name, so the speakers got assigned to different rooms.
5) I go through the tuning sequence and whatnot. All good.
6) At this point, both the Play 1 and the Play 5 work. But! They're in difference rooms in the app. Which creates issues for trying to add and group other rooms in my setup. I need these two speakers to be in the same room in the app.
7) I go through literally every menu in the app trying to find an option to assign both speakers to the same room.
😎 I spend 2 hours reading message boards.
9) I throw my arms up and write this message.

Am I missing a really obvious setting somewhere? Is it really this hard to just move a speaker?