Arduino Uno & 16x2 LCD Display w/ 4 push button and 2

Hello, I'm looking for assistance in generating a menu for my project. I need a 4 button menu for our design. We want to able to push 1 of the buttons and then use the potentiometer to vary and change the settings within. For example we want to be able to push button 1 which will be labeled "Constant Current" and open that menu and be able to set a certain current value we want. I have attached the schematic and layout of our design to hope help some more. Thank you

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