How do you tell when the radiator is full? on 2000 Dodge Dakota

I have never filled a radiator in the middle of the hose before.

Asked by for the 2000 Dodge Dakota
you don't have to do it there unless the first thing in the morning before starting your truck. beside your radiator fan there's coolant reservoir black in color when you open it there's plastic dipstick to check your coolant level.
Thank you very much for the information.