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.
If you have v7, you can check out this help document from the GoDaddy help center: Add HTML Code to a Page
For the time being, newer versions of the GoDaddy website builder will not allow you to add custom HTML. GoDaddy should be releasing this functionality before the end of 2017.
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.