Whitelisting IPs in htaccess

I have started using Cloudflare for my blogs.

I want to whitelist their IPs in my htaccess, but, although I can find a lot of information around the Web about the instruction: Please note: These ips should also be whitlelisted in /etc/csf.allow and /etc/csf.ignore. I just can’t see where in htaccess they would go.

Could anyone tell me exactly where this should go in my htaccess?

One of my blogs is https://www.expatsinspain.co.uk