Getting into the settings of a router

I recently was given a linksys router by one of my roommates and am trying to set it up for my parents. My problem is the wireless network is password protected and the settings panel is password protected as well and my roommate does not know either password. I've tried all the usual passwords but none of them are working. Is there anyway to do a hard reset to take all of these passwords off? I do have physical access to the router.

I know this sounds fishy, so if its a problem to ask just go ahead and delete the thread, but if I could get any help I would appreciate it.