In order to add Librti as an app to your mobile device or to add Librti to your homepage, you need to visit Librti.com in your mobile browser.

Then, you will see a banner at the bottom of the page, asking to add Librti.com to Home Screen.

If you do not see that banner, you can open your browser menu (as per the attached screenshot) and press "Add to Homepage" or "Install App" to get the app icon on your home screen.