Ensure you're on the Dashboard of the site. Click Dashboard in the navbar if you're unsure of where you are or click this link.
Click the Share arrow which is a small box at the bottom of the screen with an arrow pointing up.
This brings up a variety of options. Typically you have to scroll right till you find an icon that is a box with a plus sign like so
Click this button and it should bring up a dialog box which will have the Title of the site already in it. Click Okay then Navigate to your Home Screen to find your Link.