There are a couple of things you should do first, before you can use all of Git's power:
git remote add [remote name] [remote url (eg. 'git@github.com:/ajaxorg/node_chat')]
[Enter]git add [file1, file2, file3, ...]
[Enter]git commit -m 'added new files'
[Enter]git push [remote name] master
[Enter]That's it! If this doesn't work for you, please visit the excellent resources from Github.com and the Pro Git book. If you can't find your answers there, feel free to ask us via Twitter (@cloud9ide), mailing list or IRC (#cloud9ide on freenode).
Happy coding!