If you don’t know how to enable the new extension for use in Safari
Open Safari, tap the share button (AKA the square with the arrow on top). Then scroll the top row (where the mail/message/twitter/facebook icons are) until you see “More”. Then toggle the “Add to Readability” so that it’s “On” (AKA, it should be green). If you plan on using it a lot, hold down the three lines and drag it to the top. There, now you can share to Readability with mobile Safari.
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Readability™