no subdomain possible

Hello, I have multi domains installed and I have entered on the multodomain page. Then in cpanel in subdomains I created a wildcart subdomain, which looks like this * But when I create a new user and with that account a subdomain on, 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?