Selecting iso curves

I’m studying a tutorial that was made in the windows version and there comes a point where I cannot duplicate the process. It involves apparently selecting an iso curve and arching it to a regular curve. A change is made in the properties menu that I can’t find in the mac version. I’m including a link to the point in said video.

What am I missing, and/or where is it to be found?

Run the ExtractIsocurve command.

Thanks, I really appreciate the quick response.!