It's on Cake Central, but right now I can't get in and I don't have it saved...something I need to do! I remember everything except for how much powdered sugar...
Basically, for a 5qt ka, you'll use 5 cups shortening and and I think it's 5lbs. powdered sugar (might be 6???) along with 12 Tablespoons of of the creamer mix and 4 Tablespoons of flavoring. She uses wedding bouquet, but I don't like it so I just use clear vanilla in it's place.
I have a 6qt, so I increase the amounts so that the mixer will be full.
The video does a great job of showing you how to make her icing.
YouTube - Making a Batch of Buttercream Icing by SugarShack