Embedding an external widget in Discourse

I tried putting the code in the Easy Footer plugin and then tried it in the head of the theme. I’m expecting a pop up to appear at the bottom of the page so people can raise a ticket or ask a question. The Zapier integration would cost extra and might need to have a user logged in to post in the category that would pull requests into Jira Service Desk. I want it to look like it does on https://mystrokeguide.com