Whirlpool Solutions washer not draining (sock involved, I think)?

I'm sure there is a sock stuck in the drain hose of my Whirlpool Solutions washing machine. The water will not drain but the pump grinds away. I have disconnected the hose from under the sink and drained the water away, ever so slowly, into a bucket. I have had the back off looking but I don't know how to find the filter piece to clear it. There is a flap that runs along the bottom front of the machine but there is no filter or anything there. Can anyone tell me how to get to the filter (pump, or wherever the sock may be) so that I could clear the blockage?