If you couldn't chat or the dialog box for typing text didn't appear, it might be because there was a problem with the network connection or the browser settings were affected. You can try to restart the browser or reload the webpage to ensure that the network connection is normal. If the problem still exists, you can try changing the browser's display settings to see if it can improve the problem. If you are using a chat software, you can try to clear the buffer and data in the chat software or re-install the chat software to ensure that the Chat features is normal. If none of the above solutions work, you can try contacting your internet service or browser manufacturer for further help.