Hello! I understand the Hardee's app is not showing up on your iPhone screen. Let me help you get that sorted out.

Could you please tell me a bit more? For example:
- Did you recently install or update the app?
- Is the app missing entirely (no icon on your home screen)?
- Or does it open but displays a blank or white screen?
- Have you tried restarting your iPhone or looking in your app library?

Knowing these will help me guide you better. Meanwhile, here’s a general step-by-step you can try since you’re on iOS 18.6:

1. Search on Your iPhone: Swipe down on the home screen and type "Hardee's" in the search bar. This checks if the app is somewhere, maybe hidden in a folder or App Library.

2. Check App Installation: If it doesn’t show, open the App Store, tap your profile icon (top right), go to Purchased > My Purchases, and see if Hardee's is installed or needs to be re-downloaded.

3. Reinstall the App: If you find it installed but not appearing, delete the app by pressing and holding the icon (if visible) till it wiggles, then tap the X or "Remove App." Afterwards, reinstall from the App Store.

4. Restart Your iPhone: A simple restart can clear glitches. Press and hold the power button and either volume button, then slide to power off. Turn it back on after 30 seconds.

5. Check for iOS Updates: You’re already on 18.6, which should be compatible, but double-check by going to Settings > General > Software Update.

If after these steps the app still does not appear, let me know what you observe exactly, and I can suggest deeper steps or help you contact support.

Does that sound good to start?