Hi John,
I'm also new to Geppetto (using version 3.2.0), but I've found the built-in help to be really useful for configuring version control. I'm using Git, so a little different, but all the VCS options are under Window -> Preferences -> Team. If you expand Team, click on SVN then click on the question mark 'help' button in the bottom left hand corner, it should pop up a sidebar with a link to "SVN Preferences". Click on this and you'll get the "Subversive User Guide" which runs through all the options.
Hope that helps!
Simon.