Because far as I know, that disappeared years ago. Look all as I might, there's no option to bookmark anything. You can follow a comic, sure, but that's not going to help you know which frickin' chapter you're on.
Have I missed something? Because it's being advertised when you're logged out.
Also, weirdly, when I went to post this, it hit me with a post limit, even though I haven't posted anything since, what, 2013? Surprised it went through, tbh