I see your domain is registered with GoDaddy, so check here how to change the nameservers: https://www.godaddy.com/help/change-nameservers-for-my-domains-664, then use the nameservers provided by Cloudflare.

Use Cloudflare as DNS Manager for your domain, then enable their free SSL proxy. https://support.cloudflare.com/hc/en-us/articles/201720164-Creating-a-Cloudflare-account-and-adding-a-website