MR6150 - Change LAN IP Range?

Hello. 

The MR6150 defaults to using an RFC1918 private address range for DHCP to clients (192.168.1.0/24).

I need to change this to use something different.  After looking in the device menu & settings, there doesn't appear to be a way to update the LAN IP Range. I looked in the Mobile Netgear app on my iPhone to see if it had a setting for this and I didn't find anything it either. 

So how to we change the default 192.168.1.0/24?

Thank you.

//Shawn