UPDATE
El Capitan, Sierra and High Sierra Not Currently Supported on the Modbook Pro
Get more information about which operating systems are supported

Using the QuickFlip screen rotation app
UPDATED: FEBRUARY 12, 2016

QuickFlip enables you to switch from the standard landscape (horizontal) mode to portrait mode on the Modbook Pro.
(If you’ve just logged into your system, be sure to press the Mod Key button before using QuickFlip.)
To use QuickFlip:
(1) Go to Apple menu > System Preferences > Modbook System > QuickFlip or to the Modbook icon in the upper right “menu extras” bar as shown below:
(Note: If you have a lot of icons in your “menu extras” bar, the Modbook icon may not be visible in portrait mode. If so, you can always changes orientations at Apple menu > System Preferences > Modbook System > QuickFlip.)
(2) Select the next orientation available, and move through each orientation IN SEQUENCE until you arrive at your desired orientation. Do not skip an orientation. Go through each in turn. The sequence is Landscape (Standard), Portrait (Optical Drive Down), Landscape (Fans Down), Portrait (Ports Down), and back to Landscape (Standard).
(3) When you’ve finished working in your desired orientation, return to Landscape (Standard). To do so, continue in sequence from your current orientation until you get there. For example, if you’re at Portrait (Optical Drive Down), step through the remaining orientations in 90-degree increments — that is, go to Landscape (Fans Down), then Portrait (Ports Down), and then back to Landscape (Standard).
Remember: Be sure to go back to Landscape (Standard) before logging out or shutting off your machine.
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Disclaimer
The Modbook Pro and Modbook Pro X are enclosure conversion kits that transform an original Apple MacBook Pro notebook-style computer into a tablet-style computer. Apple Inc.'s warranty on the MacBook Pro base system is voided by the conversion and replaced with the Modbook Protection Plan, which covers the entire hardware solution, including the base system.