wifi router

Guys I have a question...
because in my home i got 1 main router for the internet and I have 3 wifi router to extend some of the signal but with different SSID's
my problem is that I forgot 1 wifi key of the one wifi router that is connected to my main router..

is there anyway for me to get the key of it? or to retrieve the key.


my setup is like this

Login to that router via its web interface and change it. If you don't remember that password do a factory reset on it

+1

You'll probably have to use a laptop to do so. Turn off its wifi and plug straight into the "unknown" router via cat5 to ensure you're connected to it and not one of the others wirelessly.