IPhone 5s won't connect to the Wi-Fi?

Me and my sister got iPhone 5's today. Mine connected to the Wi-Fi no problem, but hers won't connect. We have tried connecting many times and it still won't work. Does anyone know how to fix this? Thank you!

Added (1). The Wi-Fi is password protected, I got on no problem but my sister can't. We've made sure that the password is correct, and that we aren't just mistyping it.

Hi, if you could provide me with some more information I would be glad to help you out. First is your Wi-Fi password protected? Is the Wi-Fi option greyed out or dim.

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