AndroidChrome:
Tap an “Install” button above — Chrome will offer to add the app.
If nothing appears, open the menu (⋮) and tap “Add to Home screen”.
iPhone / iPadSafari:
Open the portal link, tap the Share icon, then
“Add to Home Screen”. The app icon appears on your home screen.
Windows / MacChrome / Edge:
Click an “Install” button, or use the install icon (⊕) in the
address bar. The app opens in its own window.