Get some ender pearls by killing endermans and blaze powder which is crafted from blaze rods which can be obtained from killing blaze in the Nether. Craft eye of ender using ender pearls and blaze powder. Right click with the eye of ender on the end portal frame. Activate all frames to activate the portal.
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There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.
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.
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.
The End dimension can be left if the Ender Dragon is killed, and a portal is created, or if you die.