Can't get into admin version of website

Hi and welcome to the forum

The account section in CA never leads to the URL for administering your WP, but only to the domain
so it is normal that you have to add /wp-admin/ to the base address.

To administer your WP, you don’t have to be logged into the system here (Client Area) at all !

as for access data (user and pass) it depends on what you entered in Softaculous (if you installed via it)
or in general when installing WP.

Please read How to install an SSL certificate