you can use it as a repeater but you will have to use ethernet port
here are the following steps , 1.log in to router
2.turn of the dhcp of the router that act as repeater ,
3. change the ip address of the router page i.e 192.168.1.1 to some thing 192.168.1.x and remember that to use for router config settings
4.(optional , but recommended) in the main router under dhcp section , there will be something as reserver ip or reserve dhcp, so add the second router ip (192.168.1.x) to list with the routers mac-address to never gat any conflicts
5. now just connect 2 router with ethernet port , and walla , you are up and running
you can use it as bridge , but i am not sure it will work , also the internet light will trun on or not , but in the above method it will not its can be a bypass but works definitely
also the red light will be there as there will be no pon signal , so we can't do anything for that