Acura 2.3 CL 1999 heater question?

okay so I just got this Acura 2.3 CL V4 1999, decent mileage an stuff, overall nice car and I love it that it's my first. BUT! today it was a lttle chilly this morning before I went to school so I turned on the Heater but after I poke it at for a couple of mins I could not get it to heat up until I pressed the red/orange button with the vent and arrows coming out and I had it to mode front and legs, and the temp at 90. I kinda have no I idea how to use it, can anybody give me some advice on the best setting for it to heat faster? if they know?