Another possible solution, you can use in order to have the hyperlink to open your Live Chat, without adding code, could be to append #hs-chat-open to the end of your URL so the chat widget can launch with it. You can find more information about this option in the following article:
Please don't mind when I said that I've replied before which I didn't as I noticed this is the other thread, I've had replied to that original thread and not this one.