You may have to get rid of a few pop up advertisements. There's so much spam advertising, it's hard to see what you have to click, but that's how they keep it free.
Near the upper right corner there is a button that says "Browse...". Click it, then find your video and select it.
Then look a few inches down the screen where it says "Please enter a meaningful file description" and type a few words about the vid.
Just to the right of this text box is a little check box that says "I accep the terms". Check it.
Just below the check box is a button that says "Send". Click it and it will automatically uplaod the file. It may take a few minutes and you will see a little progress bar to the left.
When it is done uploading the video, it will make a hyperlink where the "Browse.." button used to be. It gives the URL to the video. Just give people that URL and they can watch the video.