To resolve the issue with the NGL app where the reply button is not working, follow these actionable steps:

1. Check Internet Connection: Ensure that your device has a stable internet connection. Weak connectivity can hinder app functionalities.

2. Restart the App: Completely close the NGL app and then restart it. In many cases, this can resolve temporary issues.

3. Check for App Updates: Ensure that you have the latest version of the NGL app. Go to the App Store, search for NGL, and check if an update is available. If so, update the app.

4. Clear App Cache: If you are using an Android device, go to Settings > Apps > NGL > Storage, and select "Clear Cache." For iOS, you may need to delete and reinstall the app to clear cache.

5. Reinstall the App: Uninstall NGL from your device and download it again from the App Store. This can fix bugs or issues that may have arisen from corrupted files.

6. Check Permissions: Ensure that the NGL app has all necessary permissions granted. Go to your device's Settings > Apps > NGL and check if all permissions are enabled.

7. Ensure the Comment is Available: The reply button might not work if the original comment you are trying to respond to has been deleted or removed.

8. Report the Problem: If none of the above steps work, report the issue through the app's support feature or their official contact links for further assistance.

9. Inspect for Account Issues: Sometimes, the issue can be account-specific. If you have access to another account, try logging in with it to see if the problem persists.

For additional detailed guidance, you may find the following video resources helpful:
1. How To Fix NGL App Not Working - learn more
2. Resolve App Not Working - learn more
3. Fix NGL App Not Working on iPhone - learn more

Try these steps to get your NGL reply function working again.