First determine how much liquid the feeder holds. You can do this by filling your feeder with water and then emptying into a large measuring cup. Once that amount is established, empty the water and fill the measuring cup to the same spot with nectar. Then carefully pour it into your feeder, screw the lid (which is actually the bottom of the feeder) on tightly and turn it right side up. You should see the nectar start to immediately gargle its way down into the bottom of the feeder. As long as the lid is screwed on tightly and turned right side up quickly, vacuum pressure should prevent dripping. Lastly, wipe off spilled nectar from the feeder before hanging.