On the Kalles demo, you see Back in stock notification feature show on the product page.
If you wanna achieve it for your store, kindly follow the instruction below.
1. Configuration of Back-In-Stock Notification
First, the Back in stock notification only displays if your product/variant is out of stock from Shopify admin > Product > Open the product that you configured so that the quantity is zero, as in these images below.
- Product with variants:
- Simple product:
Second, from Kalles theme > Customize > Theme Settings > Product Page > Tick on the Use a back in stock notification form?
When a customer submits the back in stock notification form for a sold out product, it will be sent to the email that the store owner used to create the store. When more stock becomes available, the store owner can send an email to the customer to let them know.
2. How to translate text in form?
To change the text in the form, please go to Edit languages > Search for the text and translate it.