Often times you may come across a post you find interesting/helpful, and don't want to loose track of where it is located. Within this system, you have the ability to "bookmark" a post, so you can find it at any time.
Directly from a post, you'll notice three small dots in the upper right hand corner of the post. Click on those three dots and select "bookmark post".
To locate all your bookmarked posts, search for "Bookmarks" in the left hand navigation (shown below)
If you wish to un-bookmark a post, click on the three dots of the post and select "Un-Bookmark post".