https://www.livechat.com/help/livechat-proprofs-integration/
Adding LiveChat to your ProProfs page | LiveChat Help Center | LiveChat.com
Integrate your ProProfs documentation site with LiveChat and allow your visitors to contact you real-time via chat window on your site.
adding livechathelp center
https://www.livechat.com/help/1and1-adding-livechat-to-your-page/
1&1 - adding LiveChat to your page | LiveChat Help Center | LiveChat.com
adding livechathelp center