You can do it yourself, on a desktop computer. Go to the main page, https://greenfelt.net, or the page for the game you like best, such as greenfelt.net/fortythieves, and then drag the icon for the page from the address bar (in Chrome this will be a padlock symbol with the word "Secure") down onto your desktop. It will create a quick access icon right there, which will look like the Chrome icon but will take you to the page whenever you want.
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You can do it yourself, on a desktop computer. Go to the main page, https://greenfelt.net, or the page for the game you like best, such as greenfelt.net/fortythieves, and then drag the icon for the page from the address bar (in Chrome this will be a padlock symbol with the word "Secure") down onto your desktop. It will create a quick access icon right there, which will look like the Chrome icon but will take you to the page whenever you want.