Compiling for Kindle .mobi

I’m trying to format the Kindle version of my client’s book, and I’m using KindleGen and am viewing the document in Icecream ebook reader but no matter what I do I can’t get the Cover image to go to the front. It shows the table of contents, acknowledgements, and copyright page, and then the book cover. How do I get the book cover at the front of the book?