I bought a DeLonghi PACC120E portable a/c with no manual. Also, how do I vent it? It did not come with the vent.

Go by a used dryer hose and hook it up to it.... then go to any home depot store near I u and ask for a piece of hard foam I can cut to the size of your window and get a dryer vent hole ( not sure what it is exactly called ...but it is a plastic round hole that vents the dryer hose outside) cut a hole in foam to fit the vent piece and connect dryer hose to it.... I bought a used one and it didn't come with the vent hose so this is how i improvised

All units of that sort come with a hose which goes on the back or the side, if you don't have this unit is useless