Add a fabric softener to the maximum fill line.

If the softener is concentrated, then it should be diluted.
Close the dispenser drawer gently.
Do not leave the fabric softener in the detergent drawer for more than 2 days. Fabric softener may harden.
Softener will automatically be added during the last rinse cycle.
Do not open the drawer when water is being supplied.
Solvents (benzene, etc.) must never be used.
Pouring excessive fabric softener over the maximum fill line can cause it to dispense too early, which may stain clothes.
Do not pour fabric softener directly onto the laundry, doing so will cause staining on the clothes that will be difficult to remove.