There are a few ways to access HTML in WordPress. One way is to simply go to the editor for the particular post or page you want to edit, and then click on the ‘Text’ tab instead of the ‘Visual’ tab. This will give you access to the raw HTML code for the post or page.
And finally, if you want complete control over the HTML code in your WordPress site, you can create a child theme and then edit the template files directly. This is not recommended for beginners, however, as it can be easy to break things if you don’t know what you’re doing.