If you wish to delete a product you created, you have several options based on whether you want to do it in the PagePilot.ai platform or Shopify.
In PagePilot.ai, you can't delete them (for the moment). However, you archive product pages by ticking the checkbox and picking the "archive" option.
In Shopify, you can delete them:
Go to product
Scroll down to the Delete Product button (red one)