Lets encrypt will issue a certificate only when the domain points to your IP address, otherwise it will issue a self-signed certificate.
Point the A-record of your domain to your ip address (or www if using it, or both). Wait till propagation is fi…
New Cyberpanel instances do not have 12345 or 1234567 as default password for rainloop. Run
cat /usr/local/CyberCP/public/rainloop.php
(sudo if needed), to get the password and then login via the web admin as usual