Sharepoint - How do you change the product key for SharePoint Server 2010 after install?

To convert a license type, you must be a member of the Farm Administrators SharePoint group on the computer that is running Central Administration.

On the Central Administration Web site, in the Upgrade and Migration section, click Convert farm license type.

On the Convert License Type page, in the Enter the Product Key box, type the new product key and then click OK.