Step 1: Fork and Config
The first step is to fork the CWAPP repository to your account. After that, you need to edit the scripts/config.js file to point to the correct instance of CWLY. Save and commit the changes.
Step 2: Create Application and Deploy
The second step is to create an application on your Heroku account. To deploy the application, click in Deploy, GitHub and Connect to GitHub. Authorize Heroku to access your GitHub account (if you have not done it yet).
The application will be deployed similar to this one here.