Just put characters, backgrounds and upload faces and backgrounds just as you would making your animation.  Then click your print screen button and copy the results into Microsoft paint. Then crop your picture and save it.  Sometimes when you add a text box, it may be better after making the scene you want with your characters, etc, to record the scene for a second and then play it back. This will eliminate the lines that exists around a couple of text boxes that show-up sometimes before a recording.  Then click the print screen button on your computer.