Neuron is not defined

Hi guys. I have a beginner problem. I set a network like that:

And then i try to change squashing function like that:

Or in a few other ways (i was trying different approaches), and the only resoult i can get is this:

"Neuron is not defined".
Can you please tell me how am i supposed to do this?
Greetings!

Thanks, solution was really simple, just needed to change this:

into this:

And then it works as it should by writing: