When reading a story, you will notice a little bookmark icon on the left margin text.
This icon will show you how far you've progressed in the text in percentage and if you click it, a story bookmark will be added in this spot.
The next time you go into this story it will automatically scroll there for you to continue.
This works across sessions and devices so you can start to read a story on your ipad and then easily continue on your desktop.
These story bookmarks show up on a special Bookmarked Stories box on the front page giving you easy access to the story.
You can also bookmark a story for later reading by clicking on the Bookmark story or Add bookmark links in the story pages or in the popup that appears when you hover over a story title. These links will typically have this icon:
If you would like to remove a bookmark, go to Stories, My Stories, choose Bookmarked Stories and click on the X where it says remove bookmark.