leighway - Usually there's a direct link from the teacher's website, so that when you click on it, you'll go directly to Craftsy and the class will be added to your "Shopping Cart".
NUBQ - Just save the Craftsy website in the Amazon silk browser. Once you sign into Craftsy on your Kindle Fire, it will save your information. You can access and watch your classes (when you're online, through your WIFI), on the Kindle instead of your computer. I hope that makes sense to you! If you need more help just PM me.