Provider packages allows you to stream your content in the app. This article provides instructions on how to install a provider package. More information can be found at the bottom of this page.
Settings > Provider packages > Install (express or kosmos)
For testing purposes you can use this url: https://raw.githubusercontent.com/synclerd/watch-now-starter/main/package.js (This is a sample watch now provider package that only shows sources from netflix, youtube and couple of more apps if those apps can be found in your system.)
If you don't find the newly installed package in the list, press back button to go back to the main settings screen and then click on provider packages again to see the updated list of provider packages installed.