What version of Dreamweaver are you using? If you are using CC you will have to install the Database and Server Behaviors add in from the Adobe plugin store (it is free).
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.