There are several ways to embed an HTML code into a WordPress website:

1. Using the WordPress Default HTML Block: In the WordPress editor, create a new post or page or edit an existing one. Click on the plus (+) button to add a new block and search for the HTML block. Add the HTML code into the block and click on preview or publish.

2. Using WordPress Plugin: If you find it difficult to use the built-in HTML block, you can use a WordPress plugin like “Insert HTML Snippet” to embed HTML code. Install and activate the plugin and click on “Add New” under the “HTML Snippets” menu. Add the HTML code into the snippet box and save your changes. You can use the shortcode associated with your snippet to add it into your posts or pages.

3. Using WordPress Theme Editor:
If you have knowledge of editing themes in WordPress, you can add the HTML code into the theme editor. Go to Appearance > Theme Editor and select the theme where you want the code to be added. Click on the file you want to edit and add the HTML code. Save your changes and refresh your website to see the code in action.

Note: Always backup your website before making any changes and avoid using HTML code if you are not sure how to implement it properly.