How to fix a bad IP address - FPP setup

[D1case]

Falcon player up and loaded on the controller.
I figured to change the IP address to 192.168.100.1
The change took on the controller, but my computer cannot access the new address. Instead I get an external site (Arris)

How can I reset/change/regain access to the FPP on my controller?
Thanks in advance!!!

 

[BAZMick]

You set the controller IP, now you need to set the computer you're using to access the FPP to the same IP subnet 192.168.100.xxx Eg. 192.168.100.10