Quick tutorial and explanation of how to get rid of black box

I just did a quick video on why and how to get rid of black box around items you colorize in Silhouette Studio, primarily in my case for cut and print (stickers of course).  I have tried to isolate this technique so it is not buried in a longer video.  The link to the bundle I got this image from is here: http://bit.ly/2kStSjX