could not find function "PCA"

Well, it's a different question from the initial one. I would rather recommend you take a look at a few resources first:

You can also us data sets that come with the FactoMineR package, here's how you can find the list.

data(package = "FactoMineR")

If you need help with your specific case, I would recommend you post a new question with the data and code that you're using, here's how:

Good luck with the topic.