Firewalla Gold Install

Hello there, I purchased a Firewalla Gold to protect my home network.  The documentation says I need to put my Comcast Modem into bridge mode.  #1 Can I still do this?  #2 I can't login in via local static IP Address for the gateway address 192.168.1.1. It's not accepting my admin password.  #3 Since the Firewalla Gold is a router are their any recommended configurations to use with my Comcast Cable Modem?  Also, I need to use a MoCA adapter, which I've purchased.  Any suggestions would be greatly appreciated!  Thanks!