Why don't I see the "Install the app" or "Install Martialnote" button?

• "Install the app" missing from the menu: the app is already installed and opened from its icon. Nothing to do.
• No "Install Martialnote" button on the "Install the app" screen: this is normal on iPhone, iPad, Firefox and Safari, which do not offer this button; the screen then shows the browser menu steps. On Chrome or Edge, the button disappears for a while after a cancelled installation: use the browser menu (⋮ > Install app or Add to Home screen).
• Opened from Facebook, Instagram or another app: open the page in the real browser (menu ⋮ or ··· > "Open in browser").
• Firefox on a computer: it cannot install a website; use Chrome, Edge or Safari.

The "Martialnote on your home screen" window only appears once, about 5 seconds after setup ends; after that, use Install the app in the menu.