Beginner question; how do i edit this text snippet?

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I want to be able to edit the description of my blog site when it’s searched online, at the moment it’s showing the description of one of my blog posts. I’ve managed to edit the text snippets for all of my individual blog posts but I can’t figure out this one? Sorry for the dumb ass question I’m very new to this and googling the answer came up with so much irrelevant info as I didn’t know exactly what to search

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