Full instructions on how to take part are at this link: http://theunitedstates.io/contact-congress/
And here is the Github repo: https://github.com/unitedstates/contact-congress/
And here is the Github repo: https://github.com/unitedstates/contact-congress/
Still plenty more to do if anyone else is interested in dropping by and helping close up issues.
Edit: intermittent GH issues.