The real power is in the Mission Hub website:
Mission Hub - Litchi
The Litchi app (for your mobile device) does the work that your pre-designed mission lays out for it. In order to transfer the mission from your computer to your mobile device, you'll need something like Dropbox. If you save the mission that you've designed - give it a name - then put it in Dropbox, if will automatically go to any devices that are sync-ed to Dropbox. Then just go to "Waypoints" in the Lichi app on your device and open the pre-designed mission. Good luck!