Certified GKH Gardening Expert
This is very simple. Cut the very tip of the pointy side of the seed shell off enough to pry open the papery covering. The seed inside can be laid sideways about 2 inches under the soil in a pot. Keep slightly moist until it germinates.
These articles will help: https://www.gardeningknowhow.com/edible/fruits/mango/planting-mango-pits.htm