The last section! Finally. To the left is the list of 'Common Events'. You have a button at the bottom to set max number of common events that are available in the above menu. The options at right include...
Name- Name the common event. Event start condition- Set what triggers this common event. Appearance Conditions Switch- You can set a switch here so that the event commands below will only occur if the switch is on.
You should be able to handle the event commands since they are the same as what you are used to.
Basically, Common Events are just events that can happen universally. You will find many uses for these convenient events.