You do not need to massage the kale for a salad, but you can if you wish to do so. Kale that has been "massaged" (rubbed with a dressing using your hands) becomes softer and even more tasty than eating it as-is. If you want to massage your kale, add a portion of your lemon vinaigrette to only the kale, massage it with your hands, then continue with the remaining steps of the recipe to assemble the salad. Don't massage baby kale if using, it's already soft enough.