Here's the video: https://youtu.be/m60sSl0buSQ
And some tips for using them...I've heard some people say that the ruffles can fall off of the cake, so make sure that you crumb coat the cake before piping them on. That will give them some buttercream to grab onto instead of trying to get them to stick to naked cake. Make sure to really adhere the top part to the cake as you're piping them. Also, don't use a dry-ish buttercream. If your buttercream tends to crust quickly and dry out, try making it with cream or half and half instead of regular milk or water.
Obviously, if you're piping a tiered cake, start at the bottom and work your way down for ruffles that hang down. If the ruffles will be facing up, start at the top and work your way down. For cupcakes, start on the outside edge and work your way in.
In the video I was using a basic American buttercream with a 50/50 butter/shortening ratio.
Kara Buntin owns A Cake To Remember LLC, custom wedding cakes in Richmond VA, and cake supplies online at www.acaketoremember.biz and www.acaketoremember.etsy.com