The X axis (the first box) is east (+X) and west (-X) for emitters/etc. East is towards the door, west is to the window in the Bedroom.
The Y axis (the second box) is north (+Y) and south (-Y). North is towards the poster.
The Z axis (the third box) is up (+Z) and down (-Z).
The second three boxes are variance in each direction, so that you can have 'spread' effects.
Setting them to [0, -30, 0] and [2, 2, 2] should make them go away from the poster (and towards you, if I have the direction right), with a bit of spread. If I've got this wrong, tell me which way it does go so I can figure this out.