Here are a few steps in creating freight in your ezimerchant control panel v5:
First step you will need to go to "Settings"
Then you will need to Click on the "Freight"Tab
Then You will need to select "Freight Services"
Once you clicked on Freight services, Just click New and It From there you will Be able to either create your own Freight Rule or select Australia Post DRC to calculate freight, Save it and your done.
Additional Steps in creating your own freight rule with selections of regions: