Yes, boil 0.0 means after boil stops, steep 15 mins. On the other hand, Dry hop 0.0 days should indicate how many days to dry hop.
You can guestimate the dry hopping by following the most popular methods, which are;
1. If you are fermenting in one vessel just add hops at the time yeast is added and leave them there until you transfer the beer out for bottling. You don't want to open up your fermenting beer just to take hops out.
2. IF your brewing method includes a secondary fermentation (you transfer to a carboy after a week or so) , adding hops at that time is common.
If your recipe is a beersmith recipe these instructions are often found in the "notes" section, design tab and look in the fermentation, and all areas for hints. Print preview the recipe as a brewsheet and classic recipe will often show the info needed.
Otherwise the recipe is lacking info, as these hop parameters can be selected and input when each ingredient is added to the recipe.