Locating CDN URL?

My platform is asking me to add a CDN URL o enable CDN API.as shown in the attached screenshot t How do I locate a CDN URL from Cloudflare?

I have a similar request or option via the plugin I’m using however, I have installed the Cloudflare plugin for CDN option but this was related to caching and not I’m on the CDN option and I cannot find a CDN URL just like yourself