OK, someone needs to make a tutorial for this...

We can't see your film, I'm afraid, and that's because we need a link.

Do you know what a link is? Well, look up the top of your screen, it says "http://www.bricksinmotion.com/" and some other stuff, right?

Well, you're going to need to make an account on youtube, or vimeo, then upload your video.

Then copy the adress of your video, and put it in the link section. (http://somesite.com/film.mov)