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There's the official source, download's right at the top.
After you install that you'll probably have to do the brief tutorial there is, it's been a while... I don't remember if it's mandatory to use the program. Anyway, when you're able to freely use it, wherever you have saved the cheat table (CT) you drag and drop it into the box area of the cheatengine window here:
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and then at the top left, click the magnifying lens button then select the game to hook into (obviously you need the game running for this)
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