Adding at the product page

Hi,

I was given a html insertion code from a website to install a widget button (measure my ring size)

I like to have this button appear on every of my product page to provide convenience to my user. How will i be able to add the HTML code using this plugin function.

Thank you.

You may find the ring size code / widget at the footer of this website for reference:
https://www.weddingrings.sg/product/j12855r/

https://wordpress.org/plugins/woocommerce-custom-product-data-fields/