Where do you put rinse aid
For most dishwashers, there will be port on the door. Usually it will be near the detergent dispenser. On mine, the two items are in one grey plastic enclosure. The rinse aid port is on the right side of the area as you look at the dishwasher door from the front of the dishwasher. Look for a knob surrounded by a few numbers and a few symbols/words. In one direction, the dispenser will be closed; no rinse aid will be released. Turn the knob fully in the other direction, it's open and the cover can be pulled up to allow for refilling the dispenser.
I hope this helps. Please add a comment with your dishwasher's make and model number for more information.