Woocommerce SSL Cert?

I have fully read and re-read and implented your instructions
https://www.icontrolwp.com/blog/enabling-cloudflares-universal-flexible-ssl-wordpress-without-infinite-redirect-loops/

on one site thevoiceofchange.info that i manage, ssl works fine in /checkout
on the other site improveyourcreditscore.info/checkout i get unable to connect

i copied the .htaccess from the working site over, thinking that may be the culprite, checked all settings

I get unable to connect error

So i even added a rule for that page in cloudflare

ALso read your instructions i could put a self signed cert on the site, not sure how to do that, i use 1and1 they force me to use their certs
i created a free cert but not sure where to put it on my site not sure it if is specific to my domain ?

everything else is the same all the same plugins etc why one site works and other doesn’t can’t debut please help your a great programmer 🙂

https://wordpress.org/plugins/cloudflare-flexible-ssl/