Can't start chat.

Hello;
I am having issues with chat… everytime I try and input any messages the box just keeps saying “sending” and never sends…. just refreshes with nothing in box.
http://o3harper.com.previewc40.carrierzone.com/bhrt-chat-room/
I am sure it is just a setting… but maybe you can help?

https://ww.wp.xz.cn/plugins/wise-chat/