Please note that the Base Cost is predetermined.
But, you now have the opportunity to choose for your Storefront different brackets, depending on how you prefer to sell.
A Competitive Price, which will give you a 15% margin on the Base Cost OR
A Premium Price, which will give you a 50% margin on the Base Cost OR
A Standard Price, which will give you a 30% margin on the Base Cost.
In your "Manage Prices" tool, you can choose either of these 3 to be implemented on all products or to change every product manually by clicking on the dollar signs.
You will see the "RETAIL PRICE" column changing colors depending on your price brackets changes, so you have an idea of the blend you are creating.
