Your username/password for commits is your wiki username/password. Since your wiki username is "David Protas" you'll commit to your branch with commands like
svn ci -m "Informative log message" --username 'david protas' --password <your wiki password>
In particular, you'll need to quote your username (it doesn't matter if you use single or double quotes, and don't quote your password - it can't have spaces anyway)
If you haven't already, please have a look at:
That, together with
should hopefully get you started.
I didn't copy over the NPL trunk, but you're welcome to do so if you want to do bugfixes also. (I figure that most people will just want to build their problem collections first, and can copy over the NPL trunk later if they want to fix some bugs, or wait until we move them into the trunk.)
Let me know if you have any questions or run into any trouble. Since that documentation has not been used much yet, I'm not sure what needs better explanation (and feel free to edit it yourself as well).