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The PrestaShop back office is the name used to describe the administration panel of your PrestaShop site in this user - guide. You will spend most of your time in this panel, as everything that the user sees is handled directly through the back office: adding/editing/removing products, handling carriers, building packs, creating vouchers, keeping contact with customers, improving your shop, etc.
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Enter the e-mail address and password that you registered with when you installed PrestaShop. Click the "Log In" button, and you are will be taken to the back office's dashboard, a sort of welcome page for this control panel.
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