Unplug your Frigidaire washer's power cord from the outlet. Open the lid of the washer.
Grab the softener dispenser on top of the agitator and remove it from the washer. The softener dispenser simply lifts off the agitator. You now have access to the agitator cap.
Place a rag inside the top of the agitator and over the handle of the cap. The rag helps protect the cap handle from damage.
Grasp the handle of the cap with the rag over it with a pair of pliers. Twist the handle right to left while pulling it out of the agitator. The twisting action helps break any suction seal between the rubber edge of the cap and the inside of the agitator.