Build an Enderman portal using a 4×3 frame made of end portal blocks
Arrange the blocks in a 5×5 square footprint with the correct inset pattern
Place end portal blocks in the positions that form a portal frame (the 12 required end portal blocks)
Ensure the structure is exactly aligned and complete before activating
Activate the portal by throwing an Ender Pearl into the portal frame
Step into the purple portal once it appears