I Am new to after effects. I added a song into the main comp, but it's only playing a few seconds of it in the begining. Where exactly do I need to add it to in my timeline, in order for the song to play for the length of the video? Or, how do I edit the length of the audio?
How are you playing it back? If you're new to AE, previewing is confusing. I'd strongly recommend Dave's link. AE is way more complicated than most new people think and jumping right into the deep end usually ends in a drowning if you don't know how to swim first.