Place cursor within the timeline, and click and drag to left or right.
Click on blue lines or colored circles to retrieve pop-up information about an event.
(To view more text within pop-up, scroll down. To close pop-up, click on "x" icon in the upper right corner).
To rapidly navigate, double-click within the timeline to activate back/forth navigation.
Video Tutorial: How to use timeline (Duration: 1:08 minutes)