Step #1. Getting the paste code
Step #2. Adding the code to the page
Go to the dashboard of your Wix site and go to the page where you'd like to add the code to. Click on the "+" icon. In the menu that will appear, choose More — HTML iframe.
In the block that will appear, click Paste code and add the code you've copied before. Then, click on the Apply button.
Publish your site. Yay! Now you're all set.