When you boot the game you are taken to the Helix System select screen. There are 12 experiences that are apparently available for this Abstergo Entertainment System: Helix. A few of the Experiences on the select screen are referencing past Assassin's Creed Games. At present you have one experience available: The Tragedy of Jacues De Molay".
This is the first option selected. It sits in the top left corner of the screen. You can listen to the voice over or jsut begin the memory itself.