Where To Put Code For Chatbot ?

Hello, im wanting to add a chatbot to my site that answers basic pre-loaded questions as a pop-up, or to the bottom right of each page.

I've got a code and it was suggested the header script, but this positions the bot at the top of the page above everything else on the site. if I place the html code on a page, either in page designer, or on the "embed video or code" space, for some reason it ceases to work.

My expert level is "tinkerer" so no doubt user limitations, but any ideas?
I'm happy to share the code if it's something that can be added for all users?

Would absolutely love the code once we work out where to put it!

I think I saw on another thread that it need to be manually added to each page. Not 100% sure though :-)

yeah, the code ceases to work then - not sure why?