Gather 12 End Portal Frames
Gather 12 Eyes of Ender
Find a flat 3×3 space
Stand inside the 3×3 space
Place 3 End Portal Frames on one side
Place 3 End Portal Frames on the opposite side
Place 1 End Portal Frame on each remaining side
Make sure all 12 frames form a complete square around the center
Insert 1 Eye of Ender into each End Portal Frame
Ensure every frame has an Eye of Ender
Enter the activated End Portal