Upload your plugin. You have two options here, either unzip and upload the plugin's "wp-e-commerce-call-for-price" directory to wp-content/plugins or you can go to backend of your WordPress site and upload it via "Plugins" -> "Add New" -> "Upload"
Activate Plugin in "Plugins" list
Go to "Settings" -> "WPEC Call for Price" and set the default "Call for Price" message and pick one of the Icons to be shown in the front end
Go to "Products" and Edit the Products that you wish to your customers to call for price for. Open the product for editing, in the price control box you will see a "Call for Price" option.
Click on "Call for Price" checkbox if you wish your customers to call for price for this product. Once you click you will see a Message filed you can add a custom message there to let your customers where to call to or you can leave it empty, in this case the default "Call for Price" message will appear
Save the changes in the Products
Requires: 3.1 or higher Compatible up to: 3.4.2 Last Updated: 2012-4-17 Downloads: 3,161