How do I get my demo app to function on heroku?

Rails
1

Locally, if I enter:

http://localhost:3000/

in my browser’s address bar, I get the default ruby welcome page.
After using git to push my app to heroku, if I issue the command:

$heroku open

I once again get the default ruby welcome page–via the heroku website.

Locally, if I enter:

http://localhost:3000/users

then I can access all the CRUD pages. How do I do that at heroku?