Phone or iPad remote
Prompter › Phone Remote… (⌘R), turn it on, scan the QR code (or type the link) on a phone that's on the same Wi‑Fi as the Mac. The page shows the current line big, the next lines, and buttons for play/pause, restart, sections, speed and line nudges. If the page won't load: the phone must be on the same network (not cellular, not a guest network); the window lists every address the Mac has — try the others; and check nothing else is using the port (Stinger picks another one automatically and shows it).