Initially had some syntax error which I got through by troubleshooting like this:
Using the empty_example from the p5.js complete download I was able to transfer the Processing sketch line by line; testing periodically in my browser using the local server.
I eliminated syntax errors and was able to get the p5.js version of my Processing sketch up and working.
However, my file structure or server connection still had an error so I was unable to actually open the index.html file with Google Chrome. It kept returning a 404 error or this:
...despite being able to call up last week's HTML project.
Here is a video documenting my p5 sketch.