How do I fix a whirlpool that doesn't drain or spin?

My whirlpool does not spin or drain. It will fill, agitate then when it goes into the drain cycle it does nothing. When I try to put it into the spin it does nothing too. How do I get it to work?

It agitates and at this time is sitting with water in it. I am giving a neighborhood party tonight and hope it does not stink. Also, how (if needed) do I drain it to fix it? My washer is a Whirlpool Gold, Ultimate Care II, GS09669LGO ser#CPO506841