You can add a RenderMan RIS ROP from the RenderMan Shelf or from the out pane.

Using RenderMan Shelf

We can use the ROP tool in the RenderMan Shelf to create a ROP that automatically adds an integrator VOP to your RIS Network.

Using out pane

Add RenderMAN RIS ROP

Add Integrator

In your RIS Network, add an integrator VOP inside your RIS Network, e.g. PxrPathTracer

Set the Integrator

Simply drag the path of your integrator VOP path to the Integrator in RenderMan RIS ROP.  If you skip this step, by default, it will use the PxrPathTracer integrator with its default parameters.