Disabling Cloudflare to allow script injection

I need to add a live chat script through a back end interface of our website. To Cloudflare this of course looks like an attack so it blocks me.

How can I get Cloudflare to let me do this? I tried “Pause Cloudflare on this site” but it did not pause Cloudflare on this site as I am still being blocked. I really need Cloudflare not to block me.

Thanks.