CDN on WordPress - how to configure

I need to use CDN server on my blog/shop based on WordPress. I buy fast server (SSD + 1gbps, located in my Country - users only from my country) and I configured as FTP server. how to configure WordPress to upload all media to my server?

read this then your fully understand .

https://css-tricks.com/adding-a-cdn-to-your-website/

and read this aswell please .
http://hippocurious.com/setup-a-cdn-to-speed-up-your-website/

First, transfer domain DNS to cloudflare - free
Buy or get nulled plugin WP Rocket
Buy Key CDN (affiliate link - non affiliate link) and follow the instructions https://www.keycdn.com/support/installing-wp-rocket-keycdn

I already did it with 4 pages this week. Even bought the KeyCDN for 40$. Really satisfied, page loads much faster
(I hope it's okay that I posted affiliate links, forgot if it's allowed or not - I'm guessing I'll find out soon enough )

A Content Delivery Network, also called a CDN, is a system comprised of numerous PCs or servers that contain information. When you attempt to get to information from the system, the PC that is closest your area will be utilized to present the information. This guarantees all substance asked for burdens rapidly. It additionally keeps a jug neck when all destinations ask for substance from a similar server.