no subdomain possible

Hello, I have multi domains installed and I have bbizzibb.nl entered on the multodomain page. Then in cpanel in subdomains I created a wildcart subdomain, which looks like this *.bbizzibb.nl. But when I create a new user and with that account a subdomain on bbizzibb.nl, at first it does not show the theme, after browsing to that subdomain on google. It cannot find the subdomain. Do I have to make a cname record or something similar?

Thanks
Frenk