How a sixth-former can apply for Harvard Business School?

I am an ambitious international student in UK. Next year, I will have to give a list of my UCAS optional universities, hope anyone can give me advice on how can I apply for Harvard business school in US. I know it seem like I put extra difficulties on me beside of the fact that I am going along with a top educational system. But, dream is dream and I will do my best for it. The only thing I need is some helps with the process. Please.