User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-1837347-20130919190337/@comment-5946566-20130924192544

I think you mean how to buy games on eShop, right?

You have to use wi-fi so you can use the eShop application. Then, I believe it asks you to create an account. When you are done, on the left side of the menu there should be an option to add funds to your account. You can use a credit card or, if you prefer, you can buy a Nintendo eShop Card in most of game stores (more expensive but safer). These consist on a "password".

Then search for Monster Hunter 3 Ultimate and acquire it.

Hope I explained what you wanted.