Debug Website Account Data Change

I’m stuck trying to update my own account details on a particular website. Each time I submit the change the page refreshes but nothing is saved, and the site shows no clear error message. Because I have no access to the backend or admin panel, I need someone who can diagnose the problem solely from the client side, trace the request/response cycle, and show me exactly where the failure occurs.

You’ll need to:
• Inspect the front-end code and network calls, locate the fault that blocks the update, and explain the root cause.
• Provide a practical fix or workaround I can apply from the user end—this might be a browser userscript, a custom POST request I can send with a tool like Postman/cURL, or step-by-step instructions that reliably push the new data through.
• Document the steps clearly so I can repeat the process whenever I need to change my details again.

The job is complete when I can successfully alter my account information and see it reflected after re-logging.