How do I change my name servers?

I need to setup tauberinsurance.com with WordPress.com

They’ve completed the technical setup on WP servers to successfully map your domain tauberinsurance.com to my  WordPress.com blog. Now I have to edit the name servers at Comcast to point to WP.

I would like to use my domain - tauberinsurance.com - with a WordPress.com site. In order to do this, I need to point my domain’s name servers to the following:

NS1.WORDPRESS.COM
NS2.WORDPRESS.COM
NS3.WORDPRESS.COM

WordPress.com does not permit mapping by setting an A record to point to an IP address. They require the name servers to be updated as described.