Reply to No sound from my computer

I recently purchased a launchpad, and am using a demo version of live 9, everything seems to be functioning, and I can get tracks playing, but I am not getting sound from my computer. (I-mac)
I tried to test tone, and I get that sound, but nothing from the software, or triggered by the launchpad?
Do I need to configure something I am not aware of?
I will admit right now, I did not read the manual, and am a total nube to Live AND the launchpad.

Just want to get moving!!