Hi there! I'm really sorry to hear that you're having trouble with the World Chef app. Getting stuck at 70% can be quite frustrating. Let’s work through some steps to try to resolve this.

1. Check Your Internet Connection: Make sure you have a stable WiFi or cellular connection. Sometimes, a weak connection can cause loading issues.

2. Force Close the App: Here’s how you can do that on your iPhone:
- Swipe up from the bottom of the screen (or double-click the Home button if your iPhone has one) to open the app switcher.
- Find the World Chef app and swipe it off the screen to close it.

3. Restart Your Device: Sometimes a quick restart can refresh the system and solve loading problems. Just hold down the power button and slide to turn it off, then turn it back on.

4. Clear Cache (if possible): Unfortunately, iOS doesn’t allow you to clear cache directly like Android, but reinstalling the app can serve a similar purpose. You can do this by uninstalling it and reinstalling it from the App Store.

5. Update the App: Ensure that you have the latest version of World Chef. Go to the App Store, tap on your profile at the top right, and see if there's an update available for the app.

6. Wait and Retry: If the app is still loading, it's possible that the server is temporarily busy or there are technical issues on their end. Sometimes, waiting a few minutes and trying again helps.

If none of these steps work, it may be worth checking if there's any ongoing server issue with World Chef. You can do that using their support page: World Chef Support for any known issues.

Let me know how it goes! Are you satisfied with the suggestions provided?