Get help, answers, suggestions, recommendations, reminders, and much more from Cortana, the new personal assistant from Windows 8.1. With permission, Cortana keeps a notebook of things about you to keep track of your interests so she can learn and anticipate to give you tailored recommendations and suggestions.
From the Start screen, swipe left to display the Apps list.
Alternatively, tap All apps (located in the lower-right; may require scrolling to the bottom of the Start screen).
On the "Ready to get started" screen, tap yes.
Type in your name to personalize the app or tap skip.
Tap play to hear how Cortana says your name then tap sounds good.
The next page advises you to tap the Notebook icon (located in the upper-right corner) for more options.