A reading list is a hand-picked set of posts you can share with a link, like where to start with Scott Alexander for a friend. Once published, it also shows on the reading lists page, unless you choose to keep it to the people you send its link to.
You haven't made a reading list yet. Give it a title above, or use the "Add to list" button on any post.
Read Scott like a free app: tap then Add to Home Screen. Read Scott like a free app: tap then Add app to Home screen. Add Read Scott Alexander to your home screen to read it like an app.