The option of launching netflix stays on the menu. Unless you're meaning doing something else while it's still downloading in the eshop, I think it'll close the application if you try doing so.
Sorry, but you're going to need to speak more clearly. But if having trouble trying to watch movies on netflix is what you're asking, then you're going to need a netflix account. You either have to ask your parents to pay for it or start a trial (in which, if I can remember correctly, you need a credit card in order to do so).