October 29, 2011, 06:08:42 pm
@denadder, It's easy, you just need to go to the Movie section:
In there choose: New effect > Color Effects > Overlay Image
Then, select a previously made 1920x1080* pixels PNG with Alpha channel file (*for correct ratio, don't worry if using lower resolutions for the output movie, it gets rescaled), with your logo in the place your need relative to the screen, for instance, the lower right corner.
Apply and voila.