I have Adobe Premier.. very expensive.. You need a application to allow you to add audio tracks.. here is a free one: microsoft’s Movie Maker :
assuming your on a PC.. it also has a wizard to help you burn or save for a website video
try something like Roxio Easy Media Creator or one of their products..
If you have a pc, windows dvd maker comes with most computers. There are many on the market to choose from. Depending on what type of format video is made from, you may need to convert it. This link has a lot of free stuff you can use to make this happen.