My iPhone 6 plus won't update to IOS 9?

I need hel on how or what I need to do to update my phone it really pissing me off I have been trying for like a week know I go to general and the to software update and it says update requested it does not move from that section

Try updating through itunes

  • Update stopped during ios update own iphone now phones broke I connected my iPhone 4 to my computer (iTunes) and started doing the update through iTunes. About five minutes into the update iTunes in my computer stops working, causing the update to of course stop working. Now my phone will not turn on. On the screen it is black with the 'charge symbol' as if it were low on battery and an iTunes symbol. I have tried turning my phone off and on, but of course it didn't respond.
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