If you want to add subdomains, you must not use the add domain function but the function to add subdomain.
Subdomains and email accounts can be created from user level.
From admin level, you can switch to user level, which has all kinds of other options, like email and subdomain and database and more. There is a seperate option for creating subdomains, so don't use the domain setup option for that.
Try switchting to enhanced theme and see if you can see it there.I csn go to file manager though even when I go to the user section the domain I used to setup direct adnin is not there and I can't add emails and subdomains
You mean your default domain? You didn't change anything manual in /var/www/html or anything like that correct?but the domain I added as the Web server I cant