SSL For domain instead of hostname

Hello,

I used the paid service to have the webpanel installed on my VPS today. As part of this, the SSL certificate (Let's encrypt) was installed. However, it was installed on my hostname (hostname.mydomain.com). So when I go to my website domain (mydomain.com), my browser gives the warning that the certificate is invalid. If I try using the installer to create a certificate for mydomain.com it sets it up with an empty certificate so it doesn't work.

How can I change my SSL certificate to work with mydomain.com as well as hostname.mydomain.com?

Thank you for your help.

I figured it out. No longer an issue.