The end portal frame has slots in them were you can place the ender eyes in, once you have finished placing every single slot with a ender eye the portal frame will be repair and the portal will appear. BE VERY PREPARED because once you go into the portal and get teleported to the Ender you can't go back to the Overworld until you defeat the Ender Dragon or you can jump of the world into the Void which I don't recommend, since you'll lose all your stuff in your inventory doing that.
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You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
You have to find an End-Portal in a stronghold. The probablility of finding a stronghold with an End-Portal in it is small. Because there are 3 strongholds per map, and there is 1 end-portal per game.
The End dimension can be left if the Ender Dragon is killed, and a portal is created, or if you die.
You shouldn't be able to, first off. But if you somehow smashed bedrock and all the portal blocks, you have to die to leave the End.