You need to read a little bit more, before you can install a new ROM or flash anything you need a custom recovery like CWM or TWRP -- Now to make you aware if you do this you will trigger your KNOX warranty and void it.. so think very carefully before deciding. - make sure you read as much as possible and that you have the right tools, ROM etc to hand. Or you could find yourself in deep trouble.
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The people of XDA, including the Devs. Do not have to help you. We all choose to help. Everyone also starts somewhere.
City I live in makes and invented the Kitkat... I run Kitkat on my device. Aww how cute.
CM11 N9005(Note 3) - Nexus 5(D821)