I have followed this great blog post: How to call a locally hosted server from Expo?
However I get stuck at the next step:
The above command will return a URL accessible across Internet of the form https://application-mock-server.localtunnel.me. This URL can be plugged inside the React Native code base and will be accessible from the application running inside Expo on the mobile.
I have tried to figure out how to "plug the localtunnel URL inside the React Native code base". I thought that it would be "homepage" in "package.json", but so far no luck. Can you please help?