(URGENT) 2 cameras attached to player. How to add post-process material to only one? Blueprints

Okay I figured out how to add Post process and variable node. Do I have to do something with the variable or leave it as it is default? Also I don’t know witch set node to add because there are plenty to chose from. Also where in my node tree do I plug in yours for it to work or will it work without plugging in?

I am sorry for dumb questions but I am new to unreal and worked with 3d modeling softwares before so I don’t have that much knowledge…