The following guide is for the Inteno DG150 and may be similar to other models.
1. Open the web configuration page for the router, typically http://126.96.36.199, http://192.168.1.1, or http://10.0.0.1.
2. Choose Advanced Setup, then LAN from the router's configuration screen:
3. On the Advanced Setup -> LAN page, edit the Primary DNS server to 188.8.131.52 and the Secondary DNS server to 184.108.40.206, then hit Apply/Save.