How to set browser to connect to internet using specific device?

[Fred]

Already answered this once. You can NOT unless you start manually configuring your devices. That is NEVER good as it requires reconfiguring every tie you connect to any other network. And the moment you have 2 connections you are slowing your connection as the machine has to stop and determine whcih to use for each packet sent. It must determine which network it is relevant to, decide whethr it is local or remote network and hten determine the gateway. EVERY packet. you are also messing up BOTH networks as you have 2 routers on the same subnet. TOTAL disaster. They must each have individual subnets. and if that is how little you know about computers and networking you should get someone who knows what they are doing to set this up for you. You could end up with NO Internet connection at this rate, or even passing incorrect packets to each side and both your ISPs could terminate your service. That is extremely dangerous to public network traffic.