Change IP address of ESX 4 from VSphere Client

Hi there.

    I initially set the static ip address of our esx 4 (production) server during the installation process. Now I would like to change the ip address to a different one.

    I was told I can do the above modification from vsphere client but I could not find the place. Will any of you provide me some instruction or documents so I can take a look?

Thanks very much

Lewis