Use the Create menu options to create the rendering nodes that you desire. Alternatively, you can select Create > Create Render Node or use the Create bar to access various materials, textures, lights and utility nodes.
For more information regarding Maya render nodes, see:
Opens the Create Render Node window from which you can select rendering nodes. Icons representing the nodes are displayed under each tab.
See Create Render Node window for more information regarding the Create Render Node window.