How do I change from 2D mode in Instant Engineer 14 to just draw a single line?
There are tutorials on the FoamLinx website related to the Instant Engineer. Since they're for version 14, I can say the procedure will work for you as well. To access the page, use the following URL: http://www.foamlinx.com/FAQ.html
Direct download URL to SWF in case the page doesn't load: http://www.cnclinx.com/instant_engineer_14/line.swf
Save the file and open it with your favorite video player.