Login to your customer area and click "Domains" in the left navigation bar.
In the domainlist click on the "gearwheel" on the domain which you want to setup a subdomain.
In the next menu choose "checkdomain nameserver".
In the following form, enter the entry for the desired subdomain in the lower area.
Confirm your entries by click on the button "Save".
The managing of the nameserver is self depended.
Note: The storage on the nameserver is carried out immediately. Till the change take is effective, it may take 2 - 6 hours.
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