That's OK - we're all here to learn! (At least I am.)
First, I assume you're on Windows and prefer to use a graphical tool. If so, download and install
TortoiseSVN. If not, the command-line client for various platforms is available
here.
Second, are you vaguely familiar with what revision control software like Subversion does, or would you like a short introduction? There is also a
complete manual if you want to jump right in.
For the rest, we can continue here, by PM, or on
IRC (channel #PyPRP or #writers on irc.guildofwriters.com). I don't have much time today, but otherwise I'm there on most European evenings. The other people who hang around there, when they're not away, should be able to help you too. If you want to try on your own in the meantime (don't worry if this is all Greek to you - I'll explain it in time): the repository URL is http://svn.guildofwriters.com/pyprp . You can start with checking out the
trunk (which is read-only for the public) to get the most recent code, and later you'll want to make your own subfolder under
contrib (where you can commit your contributions).