Hi there! It sounds like you're running into some issues with earning coins in Pin Out Master. Let's see if we can get this sorted out together!

1. Verify Internet Connection: First, let's make sure your Kindle is connected to the internet. A weak or unstable connection can sometimes cause issues with ads not loading.

2. Restart the App: Try closing the app completely and then reopening it. Sometimes, a simple restart can resolve minor glitches.

3. Clear Cache: If the problem persists, you might want to clear the app’s cache. Here’s how you can do that:
- Go to "Settings" on your Kindle.
- Tap on "Apps" or "Application Manager."
- Find Pin Out Master in the list and tap on it.
- Select “Storage” and then tap on “Clear Cache.”

4. Update the App: Make sure that you're running the latest version of Pin Out Master. You can check for updates in the Google Play Store.

5. Ad Blockers: If you have any ad-blocking apps or settings enabled, they might prevent ads from showing up. Try disabling them temporarily to see if that helps.

If you've already tried some of these steps, please let me know which ones so we can explore more advanced troubleshooting options! Are you satisfied with the solution I provided?