How to set up www (cname) on subdomain

I am trying to setup “www” on my subdomain,
example: is working fine and what I did is pointing “sub” A record to ip.
i tried to add a cname record(www) to “” but it says
An A, AAAA or CNAME record already exists with that host. (Code: 81053).
i want something like, should be pointed to

Thank in advance

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Hi there. I think you may need to put the www.sub portion in the ‘name’ column and then in the domain column. You should also read this perhaps: