I figured out you have to add it under teh Dialogs section, then the images tab. You can edit CompanyLogo there to point to your own image file.
How in the world can I add my own .jpg , which is pointed to by Property: CompanyLogo , so that I do not have to edit every dialog in the installer and it will just use MyLogo.jpg , which would be referenced by the Property: CompanyLogo ?
related: How do I edit Properties? I can find no easy way to edit Properties, which can then be referenced throughout the installer project.