TG3482G DHCP pool setup?

Hello, I just had Xfinity 800 mbs service installed and, they provided an Arrix TG3482G router. But the interface is a custom Xfinity instead of the standard Arris interface. My question: How do I set up the DHCP pool and LAN gateway address? The unit came with 10.0.0.1 but I need a different address for compatibility with the IP cameras, printers, and NAS I have on my network, as well as the ability to set up the ranges of the DHCP pool on ethernet and wifi. How do you do this with the supplied TG3482? I cant find any obvious way with the Xfinity web interface. Thanks!