Survival Mode method: To kill the Enderman get 12 Ender pearls, then combine the Enderpearl and flame powder into the Eye of the Ender, then right-click on a square, where it flies, you go, and then dig down from the place where it fell (there may be no trace) there may be a relic, there is an end portal set up inside the look. Stand in the middle, then place the Eye of the Ender into each of the 12 end portals in turn, thus opening it. Creative Mode Method: Find the End Portal in decorative items and the Eye of Ender in miscellaneous items.
The Eye of the Ender
The end Portal
Place the end portal.
Then click on each end portal with the Ender Pearl.
Then, the end portal is generated.
Watch out for Enderdragon attacks.
Avoid falling into the void.
This article through and friends experience, original writing.