Starred bookmarks will appear on your dashboard. If you click the play button the 3D view will open with a recreation of the bookmark.
Here are the steps to add a bookmark:
You are on the "Bookmarks" tab
Click on "New Bookmark"
2. "Take a snapshot" of your bookmark
3. Add a description (optional)
You can choose to share or not your "private bookmark / share with the project"
5. Models and revisions
You have two options: either to always "follow the latest revision" of your selected models or to permanently lock the bookmark to these current revisions "Lock to original revisions".