The dialog bitmap is the bitmap used by default in the setup wizard dialogs; the logo bitmap is the bitmap used in some parts of the setup wizard to identify your company or product and the splash bitmap is the bitmap displayed in the beginning of setup wizard.

Every bitmap you will use in the setup wizard must to be first defined in the Setup Bitmaps editor. So, before selecting the Dialog Bitmap, Logo Bitmap and Splash Screen in the Project Properties dialog, first you must to include the bitmaps you want to select in the Setup Bitmaps editor. To open the Setup Bitmaps editor select Appearance > Setup Bitmaps menu command.

After opening the Setup Bitmaps editor, add the bitmaps you want, to do that select Editor > Add Bitmap menu command. Then open the Project Properties dialog (Project > Project's Properties menu command) and select the bitmaps you added in the Dialog Bitmap, Logo Bitmap and Splash Screen properties.