Set the weight of all of your products. If you do not have a weight set, this shipping method will not work. The weight class used for weight based shipping is set by the defaultl weight class entered in the System -> Settings -> Local tab. Make sure taht your products' weight class settings match this setting.
Click 'edit' for weight based shipping in the System -> Shipping menu.
Select the Geo Zone you'd like to edit. If you do not have any Geo Zones set up, you will need to set up at least one before using weight based shipping. See Chapter 5 for instructions for setting up Geo Zones.
Enter your shipping rates.
To enter your shipping rates, you will use the format "weight:cost" using a comma "," as a separator. for example: 0:1.00,2:3.50,5:7.00,20:10.00
In this example, anything from 1 lbs/kg or less(depending on how you enter the weight for your products) will be charged $1. Anything 1.01-2 lbs/kg will be charged $3.50, anything 2.01-5 lbs/kg will be charged $7, and anything 5.01-20 lbs/kg will be charged $10. Note that any orders over 20 lbs/kg do not have a price entered, thus would not qualify for weight based shipping. If you would like to use weight based for all orders, be sure to include a very high upper weight bracket.