Can not post anything to the chat room help

https://numanme.co.uk/numanme-site/chat-1/login.php

If the above address is the address of your "problem chat": I can write there.

@numanme apparently you could still write on 26.05. What has changed since then?

tried different browsers still not working

Once again: On 26.05 you could still write. What has changed in the meantime?

I don't know what has changed that's why I'm asking fir help

Since I don't have any access to your installation, I can't change anything, and especially I don't know what you have changed in the script, or what might have been changed on your server.
I can only recommend a fresh installation with the current version.
Download here: https://webdesign.weisshart.de/chat.php

https://numanme.co.uk/numanme-site/chat-2/login.php

new char room still can not post

also checked it on 3 computers still not posting

can you suggest any thing that will help

I have also tested the current script on an IONOS server and cannot find any problem.
Something on your site or server is preventing you from writing. But I have no idea what that could be.
You were still able to write until 26.05.
Can you try to install the script under a different domain / on a different server?

I just found out that your server responds with an error 500 when sending a message (with POST).
Please ask your hosting provider what setting on the server is causing this error.

just sent them a email

got this email

Thank you for contacting support.

I have checked the backend of your site and I can confirm that there are no issues on it. To further investigate the issue, can you please provide us the steps on how to replicate it?

still not working

What do you mean by "still not working"?
What leads you to believe that it should be working now? What have you changed?