>I think it requires more knowledge of .php than
>I have (currently, I don't even know what .php is or what it
>stands for).

What PHP stands for is dumb as only socially inept nerdery can be. Moving on...

You pretty much can treat the web page's .php files as .html files. Pretend the stuff in <?php?> tags are html tags you don't understand and possibly shouldn't mess with, and you're there -- if you can manage style sheets or normal html markup for style you're probably good to go.

Edited to add more detail as follows: PHP basically is one of many technologies that allows people to create dynamic web pages. The way the home page swaps in a different intro story randomly is one simple example of using PHP for dynamic content.