Tips on Adding the Plugin:
If your website uses a WSYWIG editor (what you see is what you get), there’s usually a button called Source, Code, or HTML that you can use to toggle to the markup view.
Click this, then paste the code at the bottom of the page.
Start with this help document from Wix:
Once you’ve added the html code element to the page, you will need to drag and resize the element to expand it to fit the plugin. Some testing may be needed to get the plugin looking the way you want.
Due to the highly customizable options in WordPress, these methods may not work on all websites but will work for most customers.
Here’s a help document from the WordPress Codex that may be of assistance. The plugin code works best when it’s added to a Text Widget.
Leave the Title of the Widget blank, then paste the code into the main box.
Home Page Method:
If your WordPress site uses pages, you can add the plugin code to the bottom of the source code on the home page of your website.
Other Website Editors