In 'Manager', select 'Settings' from the lefthand menu and then click on 'Shipping details'.
Here, you can enter or edit your shipping address and you can also configure which regions you will ship to, and the fees associated with shipping to each region.
To add a shipping region and set fixed shipping prices, click on 'Add Shipping Zone'.
From here, you can add the region or country for which you'd like to set a shipping price, and then in the section 'Shipping Price', include the shipping rate for that region.
You can also offer shipping for free if a retailer orders over certain amount. To set the minimum order amount that would qualify for free shipping, include this amount in the box 'Shipping Price'.