Hello, UNA side, there is nothing to do but change the address in inc/header.inc.php. It seems like you did it, so I think something is wrongly configured on your server. Also, it is better to redirect all traffic to https, otherwise google considers that you have two sites with identical content and penalizes you for that.

If you are on a linux server with ssh access and certbot installed this may possibly solve your issue.

certbot -d siroxico.com,www.siroxico.com