How to BUILD A END PORTAL IN MINECRAFT PS3?

You can't.

The end portal can only be found and activated. It can't be built, even in creative mode.

Craft an Eye of Ender and throw it into the air. The Eye should move in a specific direction, then stop. That is the general direction of the nearest end portal.

Note that sometimes the Eye breaks and sometimes it doesn't. If it doesn't you can pick it up and use it again.

You find it in the stronghold. Make an eye of ender, and throw the eye of ender and you can keep throwing it in the direction it goes and once it stops you dig down.

NO IDEA! BUT PEOPLE SAY YOU CAN't BUILD IT BUT YOU CAN.