If you’ve had the free version of Matrix shipping rates installed and configured into your Magento website (great basic version), here’s a quick set of instructions of how to EDIT these. To set them up from scratch, go to webshopapp’s website
Log into your Magento dashboard, go to SYSTEM > CONFIGURATION > SHIPPING METHODS and choose WEBSHOPAPPS MATRIX RATES.
On the top left change the CURRENT CONFIGURATION SCOPE from ‘default config’ to your store name. Import and export facility now become available with an ‘export’ and ‘browse button’ now available to export the existing shipping configuration or browse, to upload a new shipping configuration.
Open the CSV (Comma Separated Values) file, adjust, edit, remove or add shipping rates and save as a csv file again (maybe call it something else so you also have the original file handy just in case…).
Go back to your Matrix Rates configuration, click browse, choose the csv file you’ve just edited and hit the Save Config Button on the top right of the screen.
Done!