Follow these steps if you wish to add your own logo:
1. Navigate to Style Your Video screen for your video.
2. Enter the "Style" tab (the brush icon on the lower bar), and click on the "Logo" bar.
4. Click on the logo and upload your own.
Recommended size is 120px Height. Width adjusts automatically
Use PNG for transparency (recommended) or JPEG.
Once you've uploaded your logo it will stay on the gallery so you don't need to upload your logo all the time.
6. Resize the logo and choose the position that best fits your needs.
7. Click on "Save" to save your changes
8. Click "Next" to continue styling your video.