Squarespace
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From the Website Management section, go to Architecture, under the Structure column

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Scroll down and click “Add widget”

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Click “Text/HTML”, then click “Select & Configure”

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Change the “Internal Title” to “Olark”, then click “Create Widget” in the lower left-hand corner

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Hover your mouse over the new widget and click “Enable”

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Back on your website, click on the new button in the sidebar labeled “Edit section HTML”

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Change "WYSIWYG" to "RAW HTML", then paste in the code from below or http://www.olark.com/install
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Click “Save & Close” in the bottom right-hand corner. That’s it!