How to re-sync with Heroku?

Newbie here (obviously!).

I'm starting a Django project in Cygwin.  I push to Heroku.  I'm playing around, checking heroku logs, and my power goes out.  So I boot my computer, get back into Cygwin, go back into my project's root.  How do I sync it with Heroku again?  If I type heroku ps or heroku login or anything, I get "heroku: command not found".  How do I link it back up so my cygwin and heroku start talking to each other again?  Thanks!

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