To upload pics to here, there's a link somewhere on the forum. but basically, you need a hosting site to upload the picture to, i use photobucket, and there it tells you which link to copy and paste, just copy the one that says "img".
Anyway, Scheffleras are fairly easy plants to keep, but having it by the air vent is a problem! they don't like to have wet soil, and it should dry out some between watering, but the vent is probably drying out the soil too much.
As far as light goes... they can survive with very little light, but won't grow much. and the better light it gets the better it will grow.
I forgot about a scheff plant that i put into a room in the basement, and it was fine with basically no light for over a week, now i have it outside, and it's growing (the temp is about 70, but when it gets cold at night time, i bring it inside)