Question: how to connect 2 routers?
Answer: Set the Internet Gateway of router 2 to router 1's IP address. Connect the two routers using a wired connection from any of port 1-4 in router 1 to any of port 1-4 in router 2. You can use a Wireless Media Bridge or Powerline Ethernet Kit to create a wired connection. DO NOT use router 2's WAN port.