If you are having trouble logging into Facebook through the MeMi Message app, you can follow these steps to resolve the issue:

1. Check Your Credentials: Ensure you are entering the correct email address and password associated with your Facebook account. If you are unsure about your password, consider resetting it through the Facebook password recovery page.

2. Update the App: Make sure you have the latest version of the MeMi Message app installed. Outdated apps may cause login issues. You can check for updates in the App Store - learn more.

3. Reinstall the App: If updating the app does not work, try deleting and reinstalling the MeMi Message app. This can help clear any potential glitches or cached data that might be causing the issue.

4. Log in from a Mobile Browser: Attempt to log in to your Facebook account using a mobile browser (like Safari) instead of the app. If this works, it may indicate a problem specifically with the MeMi Message app.

5. Clear Cache: If possible, clear the cache of the MeMi Message app. Though iOS doesn't provide direct access to cache management, reinstalling the app usually serves to clear it effectively.

6. Verify Account Status: Make sure that your Facebook account is in good standing and not temporarily locked or disabled. You can check this by attempting to log into Facebook through a web browser directly.

7. Check for System Notifications: Look for any system notifications from Facebook that might provide insights into the login issue (like account verification prompts).

8. Consult Help Resources: If these steps don’t resolve the issue, consult the Facebook Help Center for troubleshooting tips specifically related to logging in through third-party applications - learn more.

By following these steps, you should be able to identify and resolve the login issue with Facebook within the MeMi Message app.