How to merge video and audio in the video sequence editor

Hello i am using Blender 2.71 and i would like to know how can i add a video mpeg and a audio file in the sequence editor and render the animation with them merged?
When i try it i can hear the sound but the image keeps the camera view , the scene default.

thanks

Moved from “General Forums > Blender and CG Discussions” to “Support > Compositing and Post Processing”

Is the Sequencer checkbox enabled in the Post Processing panel of Render Properties?