I am assuming you mean that the cisco is the dhcp server and in that case you would change it the way I showed you. dhcp will then hand those dns servers to the clients.
router(config)#ip dhcp pool exec
router(dhcp-config)#no dns-server 64.233.72.10
router(dhcp-config)#dns-server (new DNS server IP Address)
router(dhcp-config)#exit
router(config)#exit
router#write
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