First time gitr - have some questions

First off, I may be in the wrong place, but I need a sanity check here.

I've downloaded and am attempting to use the git bash app, trying to issue the following command and am getting fatal: Not a git repository

git submodule add git@github.com:toltmanns/steal.git public/steal

I went through directions here - http://www.javascriptmvc.com/docs/getstarted.html#&who=install

Made it to creating the github account and forking the codesets needed.

Am I missing something?

Thanks in advance, Troy Oltmanns