The amount of maple syrup or agave nectar you use will depend on how tough your dates are, how thick your almond butter is, and the type of blender/mixer you use. I would suggest starting out with a 1/2 cup of maple syrup or agave nectar and then add the remaining 1/2 cup in 1/4th-cup increments. You may be able to get away with a little less liquid than the recipe suggests.
Find it online: https://www.spiritedandthensome.com/no-bake-almond-butter-bites/