Urgent Problems with Subdomains

Howdy Community ...
Great day today. The sun in shining on my back and i ...

sitting in front of my monitor!  

Problems are: Want creating a subdomain,- like my old servers, but cant.
(WHY?) ...

Used following adjustments:

1.) created no user, admin direct hosting. (No other plans)
Used "create subdomain" mysub (mysub.domain.net)

NO DNS!

K. (!)

Hello google | manual ...
(mommy always said... R.T.F.M)

K... (!)

Created in apache2 (global use of domain) = domain.net as a main TLD.
Now back in admin created TLD. mysub.domain.net


Nothings works! (after 2 days i was afk)
Whats wrong?

Tried different options. With A/CNAME

Is shared domains without ending after dot or with? (net,com,org,ai,flowers and so on)

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