You can add new products to your products database by selecting the "New" menu option from the popup menu. 
Normally this is not necessary since the Amazon MWS Integrator for Communique will automatically download all necessary product information that you are selling on Amazon.
However, there may be circumstances where you might want to add a product to Communique before it is listed on Amazon. Using the Add Product dialog is the way you would perform this task.
The only required field is the Product SKU. All other fields are optional.