Click the gear icon on the far right of the page for the specific warehouse ("fulfillment node") => Select "Edit Shipping Settings" from the dropdown menu
In the popup that appears, go through each step by clicking the "Next" button.
We recommend matching your total price (item price + shipping price, if any) with your pricing on Amazon. Please avoid double-charging for shipping -- if your pricing is "Free Shipping" on Amazon and that is the price you are sending to Jet, do not add shipping cost in Jet's fulfillment node setup as that will price you out of the market and can result in your SKU(s) not being approved for sale by Jet.
If you are charging for shipping some or all shipping service levels / or carriers, we recommend using "Price Banded" unless you sell products that are over-sized with a wide shipping cost variance.
FBA Fulfillment Node Example
To get started, here's a Price-Banded shipping model that should allow you to start generating sales on Jet for inventory fulfilled via FBA. Note how the Standard service level is competitive and shipping is free for the customer once the value of your merchandise in their cart reaches $25.