Open this page in Safari. Tap Share → Add to Home Screen → Add. If shown, turn on “Open as Web App.” The button on your website cannot install it automatically.

En Safari: Compartir → Añadir a pantalla de inicio → Añadir. Activa “Abrir como app web” si aparece.

Open the installed app online once and wait for “Ready offline” before using Airplane Mode. / Abre la app instalada con internet y espera “Lista sin conexión”.