You can quickly categorize a recipe by visiting the recipe page and using the two category and subcategory dropdowns that appear just above the recipe's ingredients.
To categorize an existing recipe, visit the recipe page and select "Edit" > "Edit recipe." From here, scroll down to the "Categorize this recipe" section and use the two dropdowns to classify your recipe.
Users can also also categorize publicly clipped recipes that haven't already been categorized. If another user's clipped recipe hasn't been categorized, you'll notice two the dropdowns that appear just above the recipe's ingredients -- adjust these to help improve the quality of BigOven's search and Recipes by Course.