How to Change a CNAME

Most Internet users pay a hosting company to handle the technical details of keeping a website or blog online. Depending on the hosting company, changing your CNAME record can be a self-serve matter or an email request.
Users of the GoDaddy domain hosting service, for example, can change a CNAME record in a few steps. Log into your Account manager, select My Products > Domain Manager.
In Domain Manager, pick the domain for which you want to create an alias. Click the 'Total DNS Control and MX Records' link and add the new CNAME record.
CPanel is another common interface used by some web hosting firms. CPanel allows you to forward a sub-domain to another domain, but most do not allow you to create a domain alias using CNAME.
CPanel users without the ability to change a CNAME directly will need to contact support personnel who can edit the CNAME entry for the particular domain. Once edited, the domain redirection should be active.
VPS Hosting