In order to edit product go to Non Connected products and click Edit in import list.
You can change description of the product: change the text, remove unwanted pictures, set the price for every item, if you need.
After editing click Save to Shopify to make the product available in Shopify. Click Safe for later to keeping the edited product in Dropwow without listing in Shopify. You can find these products in Non Connected then save to Shopify when you need.