How to exclude certain pages from CDN caching?

Control Panel V5 > Hostings > CDN
1) Go to CDN section to get your cloudflare login email address and password.
2) Login to cloudflare
3) Next to your website, there’s a little icon, click on it and you’ll see a dropdown menu.  Select Cloudflare setting
4) In Cache Purge section,  click on Page Rules