Hello! I understand you're having trouble starting the parking time with the Park app on your iPhone. Let's work through this together.

Could you tell me a bit more about what's happening when you try to start the parking session? For example:
- Are you getting any error messages?
- Is the app freezing or crashing?
- Does it let you select the location and time but won’t let you start parking?
- Have you tried starting parking in different locations or zones?

Meanwhile, here are some initial steps you can try to help resolve the issue:

1. Check Internet Connection: Make sure your iPhone has a stable internet connection via Wi-Fi or cellular data.

2. Verify Zone and Time Restrictions: Some parking zones might be closed or restricted during certain hours, or you might have reached the maximum allowed parking time for that zone.

3. Restart the App: Close the Park app completely by swiping up from the bottom (or double-clicking home button) and swiping the app away, then relaunch it.

4. Restart Your iPhone: Power off your phone and turn it back on to clear temporary glitches.

5. Update the App: Go to the App Store and check if there's an update available for the Park app; keeping it updated fixes bugs.

6. Reinstall the App: If the above don't help, uninstall the app and reinstall it. This refreshes the app’s data and cache.

7. Payment Methods: Ensure your payment method in the app is valid and hasn't expired; sometimes the app won’t start parking without a valid payment set up.

If you have tried some of these steps already, please let me know which ones, and if you see any specific error messages, share them with me so I can guide you better.

Are you ready to go through these, or do you want to provide more details about what’s specifically happening?