Drainage Data File?

I'm trying to use the Storm and Sanitary product add in to design a storm drain system. However, whenever I try to use anything in the Drainage tab (e.g. Drainage - Lay Out or Drainage - Edit/Review...) I get an error stating "You must have an open drainage data file". How do I create/open a drainage data file? I've setup my Project Defaults and they look like this: 

As you can probably tell, I'm very new to InRoads. Thanks in advance!