Why won't my Wi-Fi connect at school?

So at my school the Wi-Fi password connected for me once, and then it changed, so today I typed it in right and it said unable to join so I tried to join again and it just had the loading sign next to the Wi-Fi and I waited and waited but it wouldn't connect. I tried restarting my phone and I re entered the password and it would not work and i don't know why. I have a iPhone 6 on iOS 9.1

Tell your device to forget that Wi-Fi network. Then connect as if you are brand new to it

If password has been changed then it can happen.

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