esperanza,The hive top feeders I've see go on the hive body, then you put an empty super over it with the covers on top of the empty.I've never actually used the hive top feeders( I get buckets for free and make my own), so setup may depend on the style of feeder.Some are enclosed so you can fill without having the bees buzzing you. You can feed till there's a nectar flow. If they're on new foundation, they'll need the syrup to help draw out the comb if there isn't any nectar available.