What is an End Portal?

End Portals became a functional feature in Minecraft PE when Update 1.0 was released. End Portals are a portal that enables you to be telepored to The End, which is an island of End Stone with Endermen. End Portals are organised into a horizontal ring shape five blocks square and are found within Strongholds in their own 'Portal Room' which will be hidden among a maze of other rooms within the Stronghold. There is only one Portal room per Stronghold and it will contain a Silverfish Spawner which can easily be killed using a sword since they only have a melee attack.

How do you Complete an Existing End Portal

To complete an existing End Portal you must add the 12 Eyes of Ender by placing them inside each of the end portal frame blocks. Once you have accomplished this the End Portal will activate. Note: The End Portal Frames with the Eyes of Ender have different block IDs and they cannot be removed from the portal blocks once they have been placed.

Can I Build an End Portal in Creative Mode?

To craft an End Portal in Creative mode you will need 12 End Portal frame blocks and 12 Eyes of Ender. Surround the sides of an empty 3 by 3 square with End portal frame blocks and then fill each of them with Eye of Enders. It is not necessary to have the portal frame blocks at the corners but the last Eye of Ender placed must be facing inward, i.e. placed with you standing inside the ring. If you have done this corectly the End Portal will activate enabling you to go to the End biome and battle the Ender Dragon.

The video below is a tutorial on how to build an End Portal in Creative mode