HERE'S HOW TO DO IT:
From the Jaman main page, go to the sliders and click Select Genres:
That will open up your menu of genres to choose from. To make our selection more clear we're going to select a pair of not-often combined genres, namely Comedy and Documentary:
So rather than have comedies and doumentaries, the search now puts movies that are comedies AND documentaries atop your selections. Visible there are movies like Good Hair, a funny but informative doc featuring and presented by Chris Rock; Crumb, a funny (if unsettling) portrait of the underground cartoonist Robert Crumb; and The Muslims are Coming!, a movie that follows a tour of Muslim comedians and explores issues of Islamophobia, the red/blue state divide, and religious stereotypes.
As always, clicking the Select providers tab will let you narrow the focus of your search to the providers you regularly use (like Netflix, Amazon, etc.).