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You can't. Go to " The End " to fight the Ender Dragon.
There is not an End Castle in minecraft, the End is basically only to fight the Ender Dragon. But maybe we will see a Ender Castle in further updates.
The large towers have energizers on top which give the dragon health. First, you will need to destroy those, then start to attack him.
If you have cheats on(commands, such as /gamemode 1) you can type in /summon EnderDragon and boom. Without cheats... too bad.
You must collect 12 Eyes of Ender (made by combining an ender pearl and blaze powder) and search for one of the three strongholds in the world. Since there are only 3, strongholds are extremely tough to find, and it is recommended you bring more than 12 Eyes of Ender because these may be used to locate a stronghold's End portal room, flying in the direction of the stronghold. If you're lucky and you find the stronghold and portal room, insert 12 of your Ender Eyes into the portal blocks by right-clicking them with the eyes, but be careful of the silverfish spawner. Once you're ready, you can jump in the portal to go to the End and fight the enderdragon.