Idk where else to post this, but it seriously needs answered.

I'm probably just really dumb and I can't figure it out, but I don't know how to transfer a file already on my computer to Windows Media Player and burn that onto a DVD-R.

It's gotten more complicated...

So, it's originally on Quicktime, but it won't burn to the DVD-R from there, plus there is no audio for the video...I transferred the video to Windows Media Player, but it's only audio now, and no video, and I don't know how to put both together.
Anyone know how?