add an iframe

I have added a js file to the theme. Now I need to add a code to html to activate the iframe. This iframe is only for the single product pages add description and photos from another website.
How do I add the html code

thanks

Hello,

Please check this Manul how to add HTML code:
https://www.wpbeginner.com/wp-tutorials/how-to-edit-html-in-wordpress-code-editor-beginners-guide/

Best Regards.

[Author]

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