Try using the "search" function on the forum!
You'd have come up with this:
Era/Period = Moments in time (also known as history)
1. Go to the chapter selection and highlight history.
2.Start the period = push ok (starts playing history section)
3.Hang the left/reverse the era = push the left cursor (what moves the highlighter) and hit enter.
Welcome to the Easter Eggs.
J-Dubya