I have added some vertex paint and would like to see it in the render.
It looks simple enough on all the tutorials, except I don't have those options available; Having spent hours researching I am still lost, how can this be done?
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You should plug your vertex colors into the color input of your shader.
You can change the type of your new window with the button on the bottom-left -- select "Node Editor"
You can check the name of vertex color layer in the Vertex Color section of the Object Data tab in the Properties panel: