How to add sound in a video clip?

[MacNoobGuy]

hi all, i'm wanting to change the audio in 4 minute video clip here. i want to take the audio from a video file. can anyone explain how i can do this?

i've never done anything like this before so i'd appreciate any help!

thanks for any help!

 

[Dave Braine]

Import it into iMovie(which you should have on your Mac), then you can either Detach the Audio and delete it, or just mute it and then add your own audio track.