How do I change my IP address?

> I'm using this: [...]

   While you were there, did you fetch the C7100V User Manual?

> I can't seem to find the option to change my IP address. [...]

   What, exactly, does "my IP address" mean to you, and why, exactly, do
you want to change it?

   Presumably, you, personally, do not have an IP address.  Your C7100V
cable-TV modem+router has two IP addresses: LAN, and WAN/Internet.
Which one is your "my IP address"?

   The LAN settings should appear in the C7100V management web site at
ADVANCED > Setup > LAN Setup.  The WAN/Internet settings should appear
at ADVANCED > Setup > Internet, but the typical arangement for these
involves "Get Dynamically from ISP", which means that your ISP, not you,
determines your WAN/Internet IP address.  In some cases, disconnecting
your C7100V from your ISP might give you a new WAN/Internet IP address
when the connection is reestablished, but that still depends on how your
ISP arranges such things.

> [...] I was able to consistently change my IP [...]

   How, exactly?

> [...] with my previous Netgear router, [...]

   Not a very detailed description of anything.