Unplug the washer.
Slide a putty knife under each side of the washing machine top to release the springs holding the top in place. Lift up the top on its hinges.
Pull the tub clips from the inner tub using a pair of pliers.
Pull up on the agitator top to expose the nut holding it in place. Remove the nut using a socket wrench. Lift up on the agitator to remove it from the machine.
Turn the agitator upside down and remove the seals from the bottom. Replace them with a new set of seals. If the agitator is cracked, replace it.
Reassemble the washer.
Unplug the washer from the wall outlet.
Pull out on the bottom panel on the front of the machine. Look underneath to locate the drive belt.
Pull on the drive belt at the washer tub to remove it. Push down on the idler pulley near the motor to remove the belt from the machine. Route the new belt around the pulleys in the same way as before.
Reassemble the machine, plug it in and test.