Website is stillnot secure

I have just completed the steps required for the SSL setup by checking that my IP address is correct and then accurately entering the new nameservers which are provided by Cloudflare. Everything looks fine and Cloudflare also says that they’re protecting my website but the lock icon is not showing although the site is on https://. It’s still “not secure”.
How can I fix this issue?

Was your site secure before you added it to Cloudflare? If not, you need to complete that first and talk to your host about it.