MG8702 DNS

Just upgraded to a Motorola 8702 modem/ router combo, purchased 3rd party.

Local clients receive 192.168.0.1 for DNS and don't have internet access unless I manually change it in each device to 8.8.8.8 (Google dns). How do I change this within the router so my devices will receive 8.8.8.8 via the router?