After you are finished with calibration you are ready to record. You can set the folder in which EF EVE will store your captured events by pressing on the little folder icon with green circle.
After that you can press Rec button to start recording. Countdown from 3 to 0 will start and after 0 the app will start recording. Once you are done with your recording press stop button and save the file.
Try "photogammery", "diorama", or "dinosaur", for some cool results.