Defeat the Wall of Flesh to enter Hardmode
Open Hardmode chests, craft them, or buy them from NPCs depending on the wing type
Craft basic wings at a Mythril Anvil or Orichalcum Anvil using Souls of Flight and other materials
Get Souls of Flight by defeating Wyverns in the Sky or Space layer
Buy Leaf Wings from the Witch Doctor at night in a Jungle biome after Hardmode begins
Buy Harpy Wings from the Traveling Merchant when available
Craft Angel Wings, Demon Wings, or other wings using Souls of Flight and specific drops
Defeat Hardmode bosses and enemies for wing-related drops and crafting materials
Check NPC shops, especially the Witch Doctor, Traveling Merchant, and Pirate Invasion rewards
Use the best available wings for your stage of progression
Equip wings in the accessory slots to use them