Add a second doubler node?

I’m sure I’m missing something obvious but …

At the end of the “Basic code structure” worked example it says:
“For example, we could add a second doubler impee to the system like this:”

How do you add the second doubler impee ?

I think I figured it out, please correct me if I’m wrong.

The blue nodes in the planner are the impees, to have more than one blue node there must be more than one impee. So I need an imp in my Hannah and another imp in my April to get the second doubler impee in the planner.

Yep, you got it. One blue box per impee.