Hi there! I understand you're experiencing a white screen issue with the Rhymer's Block app on your iPhone running iOS 18.6. Let’s see if we can get that sorted out together.

To start, I want to clarify a couple of things:
- When does the white screen appear? Is it right when you open the app, after logging in, or during a specific action?
- Have you tried any fixes so far, like restarting the app or your phone?

While I wait for those details, here’s a basic step-by-step approach that often resolves white screen issues on iOS apps:

1. Check Internet Connection: Make sure you have a stable internet connection (Wi-Fi or cellular data). The app might be stuck loading content without it.

2. Force Close the App: Swipe up from the bottom (or double press the Home button if your device has one), find Rhymer's Block, and swipe it away to close. Then relaunch.

3. Update the App: Go to the App Store and check if there’s an update available for Rhymer’s Block. Sometimes white screens get fixed in new versions.

4. Restart Your iPhone: A quick reboot can clear temporary glitches.

5. Check Safari Settings: Since some apps use embedded browser views, head to Settings > Safari > Advanced and ensure that JavaScript is enabled. Also, try disabling content blockers or ad blockers if you have any.

6. Reinstall the App: If the above steps don’t help, uninstall Rhymer’s Block and reinstall it from the App Store.

If you’ve already tried some of these, please let me know which ones, so I can suggest more targeted solutions. Also, if you’re logging in and then see the white screen, it could be related to authentication or cached data issues.

Let me know how these go or any other details you can share!