How to log out of iCloud without password?

I have an old iPhone 5S that has pictures and stuff that I want to load into my iPhone 6S through iCloud. Problem is that I don't know the password to the iCloud account that is currently on my 5S and I can't log out without it. I'm trying to log out of the old account and make a new one so that I can load stuff onto the Cloud through my 5S and then download it again onto my 6S.

Go here and reset the password…

https://iforgot.apple.com/

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