First of all you need to download the Pricing add-on for the jQuery version.
After you unzip the archive, you'll find the necessary JS files in the js folder. Just include the minified version in the page in which you are already running the Fancy Product Designer.
To generate the pricing rules for your product designer, we offer a handy online tool that will create the JS code that you can easily copy & paste into your website. Just go to http://fancyproductdesigner.com/addon-pricing-rules/ and scroll down to "Create Pricing Rules".
Here you can define own pricing groups and in every pricing group you can set the pricing rules for various element properties. When you are done, click on the "GET JS CODE" button and copy the pricingRules property that you need to merge with the other plugin options that you are using for the FancyProductDesigner class (See Call the plugin section).