To display MyCustomizer in your ecommerce, you have to enable the app.
Within your MyCustomizer dashboard, go to Home.
Under Enable MyCustomizer, click on ENABLE.
Adding a starting point to your online store
Create a starting point, (Essentially, a version of your product).
Within your product page, under Online store, click on START SELLING.
Click on + ADD STARTING POINT. Adding a starting point generates a product in your online store.
Viewing your product in your online store
To quickly access your Shopify product from MyCustomizer, you can click on the more icon, then View in Shopify.