In order to make the app work on the new theme, you would need to publish it first and then reinstall our app to make sure the app script is inserted into it. You can also insert the Candy Rack script into your theme yourself.
If you are getting trouble adding the script, you can always contact Support and we can help you reinstall the script for you.
Feel free to chat with us using the chat icon at the bottom right corner of this page or you can send an email to support@digismoothie.com.