Sometimes, your Ninja will just sit there, humming, while your fruit sits frozen in a clump. Don’t yell at it. It can’t hear you. Instead, turn it off, pop the lid, and give it a stir with a long spoon.
Still stuck? Use the Tamper—that long, red stick that came with the blender. Push it down through the lid opening (yes, there’s a hole for it) and gently press the ingredients toward the blades. Never use a metal spoon. You’ll chip the pitcher.
If all else fails, add a splash more liquid. A dry blender is a sad blender. A wet blender is a happy party machine.