How do I add Kindle books to my iPad??

I purchased an iPad last night and the first thing I wanted to do was read a book on. I downloaded the Kinlde app and selected a book to buy, however the only place I could download it to was my iPhone. I tried to add my iPad to my Amazon account, however they was not option for that device. I have no clue of and easy way to get the book to my iPad. I did try achieving the book, but it still will not show in my iPad kindle page.

Thanks for any help.