Your user name is "jackp". Go to your <acs-root>/packages directory and do this:
cvs -d mailto:jackp@openacs.org:/cvsroot update .
Your password should be the same as your http://openacs.org (i.e. OpenACS) password. If that doesn't work e-mail me.
Now ... the above update may fail if you previously did a cvs checkout
using anonymous pserver. CVS seems to get confused if you mix and match Roots, at least it has in the past for me.
In that case you probably want to checkout a new copy somewhere using your account and move your work over there. There's probably a smart way to fix it but I've not looked into it ...
