You will have an access point from Insert->Paypal->various options. This is where you access the extension from within Dreamweaver. When you select one of these, you will be prompted to put in your serial number.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.