Android - Open Google Chrome and go to the app.unicopower.com Open the three-dot menu at the top right of the browser, scroll down and select Add to Home screen.

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iPhone using Safari - Open Safari and go to app.unicopower.com.  Tap the share icon, scroll down the list and select add to home screen

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iPhone using Chrome - This is a more complex procedure described at https://osxdaily.com/2020/10/26/how-add-chrome-bookmarks-iphone-ipad-homescreen/