Does anyone have an idiot’s guide to making #Cloudflare tunnels work with hosted-from-the-living-room #runtipi?

I own a domain. I have subdomains set up for the apps. I cannot for the life of me figure out how to make the tunnel I set up connect to the running app instance. I’ve got Cloudflared running on the local machine. I have no idea what to use as an A record though. #TechHelp

I’ve followed four guides including the official runtipi one and none worked. I’d get 404 or 503 errors.