At this point there should be a video of your talent in full color on the left with its background as black. There should also be a video clip on the right with the background solid black (tiny bit of grey is okay) with a solid white area of your talent.
You need to get these two clips to be exactly the same size because CREATOR will put the two clips together with the right side playing on top of the left side. So they need to be the same siaze or the transperancy will be off. (once you get this going you can fix it later!)