Linksys Wireless Router :: E2000 / Setting Static IP For Port Forwarding?

I currently have cable internet connected to one router (Linksys E2000 w/ firmware v1.0.03). That router is connected to another router, a Linksys E3200 w/ firmware v1.0.02. In order to properly forward ports through the E3200, I understand that I need to set up a static IP on that router.I've basically followed the steps outlined in this video, but when I enter all the IP addresses for Static IP settings, it won't allow me to access the router's setup page. I try entering the new IP that I've given it (which it tries to direct itself to automatically after I save the settings) and the connection times out. I am able to access the internet otherwise, however. From here I'm forced to do a factory reset on the router and start from square one.