Yes, ParseHub works with login forms (they are no different than regular forms). Check out the interactivity tutorial. If you still don't get it after that, I'd be happy to show you 1-on-1 over skype.

Please note that the password will be accessible by ParseHub, since it needs to enter it on the web page.

Currently, we support local deployments only in our custom enterprise plan. That may change in the future.