Tagging Products and Adding Weights
Tagging products with the word "charity" is how you pick the items you'll allow to be donated instead of returned back to your warehouse.
To tag products that will qualify for charity donation, from the home page of the app backend click on the "Start Tagging" link or click on the "Tag Products" button on the left hand nav.
From there your Shopify admin will open with all of your products ready to be tagged and weights added where necessary.
Remember, all product defaults to a weight of 13 ounces in the fabreturns app if you have assigned a weight in Shopify. Make sure to put the correct weights in for all your products. You could pay a higher return shipping charge if the default weight is higher than the actual weight.