Fabric softener will not clean clothes so if you pour fabric softener into the washing machine to wash clothes the clothes just won't come clean.
Fabric Softener is not a laundry detergent and cannot clean clothes and only softens the fabric.
Fabric softener is meant to be added to the fabric softener dispenser so that it goes through the clothes at the rinse cycle.
Or you can add the fabric softener to the clothes when the rinse cycle on the washing machine comes up.
To get clothes clean you need to use laundry detergent but if you want to soften your clothes you can then use fabric softener.