Agitator paddles broken because I had a big brush in the wash load.

First I removed the softener dispenser then I grabbed the agitator at the bottom and with a tug completely removed it. I took the new part out of the box and lowered it down over the hub in the bottom of the washer and gently pushed it until it snapped in place. Then I re-installed the old fabric softener dispenser and the job was complete.