Click + on the right end of the timeline. An “Add New Event” window opens where you can enter event information.

Tip: If you’re trying to read an email and enter event info at the same time, you can 'drag' the dialog to a different part of the screen if it's covering part of the email!

Tip: If you have a full address, enter it into the location field. Then, when you view the event details from the timeline, you’ll see a map of the location – as well as a handy link for driving directions.