If you haven't done any rendering before: 1) Open MixEmergency 2) Go to the menu item (on the menu bar) titled Recording and select "Export a Recording..." 3) Select the performance file you wish to record 4) I would recommend setting the dimensions to either 640 x 480 for 4:3 video, or 640 x 360 for 16:9 video 5) If you don't know a lot about video, then I would also suggest that you use one of these Presets: "High Quality, Fast encode, 29.97 FPS" <- this will produce a high quality H.264 file, will be reasonably fast, and will produce a fairly small (for video at least) file or "High Quality, Fastest encode, 29.97 FPS (Apple Intermediate Codec)" <- this will be super-fast, but produce a large file