How to add a shortcut icon 
to the main screen
Google Chrome:
pushbutton in the upper right corner → Add to Home screen
Safari (IOS): share button
at the bottom of the screen → Add to Home screen
Firefox: pushbutton in the upper right corner → Page → Add page shortcut
Opera: pushbutton in the upper right corner → Add to Home screen
Yandex Browser: pushbutton in the lower right corner → Add to Home screen
Other: if you are using a different browser, create a Bookmark 🔖 for this page.