Hi there! I understand you’re trying to update your credit card in the Mister Car Wash app, but instead of letting you enter the info, the screen stays blank with just an "x" showing. That definitely sounds like something we want to get sorted out.

To get started, can you tell me if this happens as soon as you tap the payment update area, or does it happen after you’ve tried entering any information? Also, have you tried closing and reopening the app, or restarting your iPhone to see if that helps?

In the meantime, here’s a quick step-by-step to update your payment method that might help:
1. Open the Mister Car Wash app on your iPhone.
2. Tap on the Profile icon or go to the Account tab.
3. Select "Manage Memberships."
4. Choose the membership you want to update.
5. Tap on the payment details box where your current card info is.
6. Tap "Update" to change your credit card info.

If the update page stays blank or just shows an "x" at any of those steps, it’s good to try these next fixes:
- Make sure the app is updated to the latest version from the App Store.
- Check your internet connection; switching between Wi-Fi and cellular data can sometimes resolve loading issues.
- Try logging out of your account and then logging back in.
- As your iOS is up-to-date at 18.6.2, it should be compatible, but double-check for any pending system updates.

If none of these fixes work, sometimes the app can have temporary issues or account-related problems that need direct support help. In that case, the quickest way is to update your credit card via the Mister Car Wash website or by contacting their Customer Care team directly.

You can visit this page for more details on managing your account or updating your info: https://mistercarwash.com/hc-account-management/ 1

Would you like me to guide you through trying these steps, or do you want me to help escalate this for further assistance? Let me know!