For cookie popup:

 

1.  Open https://wix.com

2.  Select your website

3.  Go over to "Settings"

4.  Scroll down to where it says advanced and click "Custom Code"

5.  Click "Add Custom Code"

6.  Then you should be able to paste your code snippet

 

For policies:

 

1. Go to the "Wix website editor"

2. Click the "+" Icon

3. Then go under the "Embed" tab

4. Go under the "Custom Embeds" tab and choose "Embed a Widget"

5. Then you should be able to paste your code snippet