When checking out a Surface Pro 3 from Ritter Library, a pen is not automatically included. You have to check one out separately.
To set up a pen with Surface Pro:
1. Swipe in from the right edge of the screen, open the Settings charm, and then tap Change PC settings at the BOTTOM of the screen.
2. Tap PC and devices on the left, then tap Bluetooth. Swipe Bluetooth to ON.
3. Press and hold the top button on the Pen until the LED light flashes on the pen clip to turn on the Bluetooth wireless technology, then tap the Surface Pen in the list.
4. The Pen and Surface will pair.