It's on the front page under the heading "quick links"

View Site Search vvv

Another way to search within any web site is to use Google Site Search, which looks like "site:websight.com search term".

In the Google search bar, you might type in something like "site:professorpaddle.com fear factor" without the quotes, of course, though, you may want to use quotes around your search term words like "fear factor". It should only return results where the word "factor" follows the word "fear", as in any Google search.

I've not used PPs search engine and it may be just fine but since I discovered Google's Site Search, I rarely bother with search engines within a web site.