Also, are you trying on a desk top or a lap top? What o/s? If windows, go into control panel>network connections, click on network connections and it show you both the wireless and either cable (local lan).
If it does not have a local, then you need to acteivate it. Go thru the setup to instal a local connection, but you will need some kind of connection to the router.
Temp relocate either the lap top to the router location and plug a cable in or relocate the router to your 2nd floor location to due the setup.
Also, after getting the connection setup, it is smarter and eaiser to use two normal either cables thru a switch to connect the two computers together.