If you booked a vacation package it's already included with the wrist bands they give you. They have an entire section just for Disney world shuttles. Just go to the section and scan your wrist bands and they'll direct you to the right shuttle for your resort.
If you're still feeling uncertain, you can call the resort from the My Disney Experience app and a cast member will go over all aspects of your reservation with you.
Exactly as Stephen Davis said. You can ask any airport employee to point you in the right direction
Thanks! Your answer is awaiting moderation.