ROUTER. having a problem with router, can't seem to get it to work like i want to, do you have to

Question

having a problem with router, can't seem to get it to work like i want to, do you have to use the same network on both computers. I want to reset password and user for my router, i need some help.I have bellsouth on my desktop and i'm using yahoo on my wife's laptop is this possible and do i have to set-up the linksys on the laptop. when i try to set-up the linksys router on my desktop it want's me to login there and i don't want that on my desktop--need some info, contact [e-mail]