You have server.example.com with ip 162.243.12.227.
You want it to host your forum on that server so now your CNAME will be:
forum.example.com CNAME server.example.com.
I.e. you say point forum to server. Server points to the IP.
You have server.example.com with ip 162.243.12.227.
You want it to host your forum on that server so now your CNAME will be:
forum.example.com CNAME server.example.com.
I.e. you say point forum to server. Server points to the IP.