please what is the name of the app I could use to install this?
Hello @jjdivasfashion1 ,
This is PageFly - Free Landing Page Builder. I would love to provide my recommendations for your store based on 6 years of providing solutions for about 100.000 active Shopify merchants.
This kind of app will be called Low stock alert. You can refer this article to find the best app for yourself here.
If you are looking for how to customize your product page this will also help you, we have a guide how to Personalize your product page, let check it out to build a high conversion page.
Hope my answer is helpful for you. Have a great day!