Answer:
Original Answer: First of all, you need to be a wizard. After that, it's actually very simple. All you have to do is run through the wall between platforms 9 and 10 to get to platform 9 3/4. There you'll fine the train that will take you to Hogwarts :)
Add-On, by Treebear13(Me): But if you want to see it in reality, as a Muggle, hitch a ride to Orlando Studios ;D