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I don't have a manual to refer to but you should be able to see it if you have a look under the dash. The nozzle faces towards the fire wall and is at the bottom of the air con unit (big black box) near your glove box.

Mine was just knocked/kicked off and it pushes back on.

If you still can't find it, turn the air con on and then stick your head under there, should be easy to see the drips.

Hope it helps. Maybe someone else has a pic or better description.

You rang

Feel about the underlay, as you may need to dry it all out.

if is not connected or cracked then thats your first problem...
if it is connected, its quite possbily blocked. get some wire and poke it down or abit of compressed air carefully.