When you first enable the "Add-ons" feature, the default additional product is Shipping Protection, with the shield image and the description "Keep Your Order Safe: Guard Against Damage, Loss, or Theft During Shipping!".
You can change this into a different additional product by navigating to "Add-ons" feature page, then edit the product title, product description, and image.
Similar adjustments can be done by going to "Products" in Shopify Admin, find the original Shipping Protection product and edit in the following section:
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