wildcard domain

I have been asked to setup a script which will autocreate subdomain for each new story / artical submitted. In reading on net I found that I need to make wild card entry in DNS .
But problem is that my Domain registrar is having an optional service ==> Managed DNS

Also I have root access to the server server so I can edit DNS stuff over there also.

Now I found from net that I need do following :
*.domain.com. 14400 IN A xxx.xxx.xxx.xx (site IP)


Now I need to know where I have to make that entry ?
In the server itself or in domain cp (Mananaged DNS service : I will then need to buy it)

Thanx for reading and help !

 

 

 

 

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