You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.
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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.
There is no way to build an end portal except on creative mode, instead you must find a stronghold which contains a portal using eyes of ender. The portal must be activated with 12 eyes of ender before you can travel to the end.