The first thing to do when creating your video is to choose a style – there are more than a dozen that can radically alter how your images are presented. That done, it's time to choose a soundtrack. You can also decide not to include any music, but it does make for a really nice addition. When that's taken care of, all that's left is to add as many pictures as you want.
Once you've finished creating your presentation, just choose whether you want to export the video in 1280x720 or 1920x1080. If you don't have a registered user account, the video will have a watermark – but to get rid of it, just make an account.