How to enable cloudflare for all page site

hello guy my self installed cloudflare in home page site have ssl but otherr page not ssl please. help me

May I firstly ask is yourdomain.com added to your Cloudfalre account and has got Cloudflare nameservers?

What is the domain name we are talking here about?

Furthermore, that other page is on some sub-domain like sub.yourdomain.com or how?

May I suggest following the instructions from below:

May I also ask what SSL option have you got selected under the SSL/TLS tab of Cloudflare dashboard at your Cloudflare account for your domain name? (Flexible, Full, Full Strict …)