Sounds like you're not saving anything.
It shouldn't take anybody long to figure out the schema behind a database if you have any experience with mysql
Sounds like you're implementing a user bookmarking system. You need to prepare your articles with some sort of identification. I'd suggest adding the post's id to the element that contains the post body. This will give your javascript something to find. Your backend script will catch that ID, ensure the user is logged in, and input an entry with the user's ID and the aforementioned post ID. Then, when the user requests his 'bookmarks', you query the table for matches on the user ID and retrieve all posts associated with post IDs.