S & M Unique Shirts, LLC review for EZ Product options & variants

I love the app, customer service is not great at all, I have not been able to get any response to any of my emails, that I have been sending since Saturday 4, 2026. I am updating my theme in Shopify and been trying to get someone to assist me in adding the widget to my new theme, I do not know where to enter the widget code so I will not lose my production options and variants.