installing disqus on concrete 5 installation

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Sorry, new to posting on forums. I am trying to install disqus onto our church concrete 5 website to keep people in touch during this Covid19 crisis.

I have the instructions from disqus. But don't know how to set the configuration variables PAGE_URL and PAGE_IDENTIFIER, see code below. I did try installing Hissy's, I think, addon for this, but while this downloaded it would not install on our website.

If this is a really easy fix I would be grateful for the help. Thank you.

Kind regards,

Stefan

/*
var disqus_config = function () {
this.page.url = PAGE_URL;  // Replace PAGE_URL with your page's canonical URL variable
this.page.identifier = PAGE_IDENTIFIER; // Replace PAGE_IDENTIFIER with your page's unique identifier variable
};
*/