How have you configured the shipping rule in the power store admin panel?
In your store products, make sure you are entering a weight. Shipping will not apply if the items in your store do not have a weight.
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.