[Q] PLEASE HELP!!!-Stock ROM ,no custom kernel can't mod(stock)5.0-ROOTED (TWRP)

Can really use a step by step on how to recovery so I can flash custom ROM-in the absolute simplest terms humanly possible.Still learning and would be SO grateful-need someone to tell me in a way I can get (and I am not completely stupid)...I want to be able to put cyanogen (or whatever else is awesome) on my phone and the recovery is all I really need help with,,,I have 5.0 lollipop on an HTC one(m7)-STOCK ROM -NO custom Kernel-and cannot mod because I am stock-merely rooted with team win recovery method.

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