No need to tap and hope you managed to click the correct link. Instead, pinch outwards to zoom in on the area of the screen you want to view more closely. If you don't get it exactly right, drag the screen into the right place. Pinch inwards to bring the page back to the normal level.
Here's a view of the usually very small "select and download a format" area of the account page.
You might have also noticed that the "Borrow" button has moved on the mobile site. You'll now see it without having to scroll downwards.
Don't forget to scroll downwards to view format information!