For cookie popup:
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Open https://wix.com
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Select your website
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Go over to "Settings"
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Scroll down to where it says advanced and click "Custom Code"
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Click "Add Custom Code"
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Then you should be able to paste your code snippet
For policies:
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Go to the "Wix website editor"
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Click the "+" Icon
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Then go under the "Embed" tab
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Go under the "Custom Embeds" tab and choose "Embed a Widget"
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Then you should be able to paste your code snippet