sidenote: I need to write a help doc.

What you'll have to do is register an account on Github: http://github.com
Then download a git client that let's you push your changes.
What OS are you on?

Here's some basic github clients to try:

http://windows.github.com
http://mac.github.com

Just hit me up and I can follow-up on how to add the repo to get you up and running.
Should be fairly painless.