Hello. Please do not post your personal information on the forum.
I think the work your are looking for is a CNAME record.
However, your site does not need an SSL certificate to run, it is working for me. The error I see is about WordPress not being able to run on a low PHP version. To fix this, do the following.
Open the control panel
Select “Alter PHP config”
Select your domain from the drop down
Select the drop down labeled “Select PHP Version”
Select the highest number available from the drop down menu.