Values you can change in the Shipping/Packaging option of the configuration menu
1.  Country Code (The country code for the United States is US)
2.  Postal Code (Enter in the zip code in which your business is located)
3.  Enter the Maximum Package Weight you will ship (Carriers have a max weight limit for a single package. This is a common one for all.)
4.  Package Tare weight (the typical weight  of packaging of small to medium packages)
5.  Larger Packages (a percent increase)
6.  Handling Fee (enter the handling fee you may charge)

How To Change A Value
1.  Click on the name of the field you wish to edit.  It will change colors letting you know its selected.
2.  Click on the "Edit" button on the right side (see Figure-1)
3.  Make your changes
4.  Click on the "Update" button to save your changes (see Figure-2)

Figure-1 Click to enlarge

Figure-2 Click to enlarge