Open the Appearance window. Click the Apple icon at top-left corner, resembling a rainbow Apple icon on color Macs, or a black Apple icon on monochrome Macs. In the Apple menu, hover over Control Panels and click Appearance.File:Change Wallpaper in Classic Mac OS Step 1.png
Select a pattern. Scroll through a list of patterns and select one you like. Click Set Desktop to change the current wallpaper to the selected pattern.File:Change Wallpaper in Classic Mac OS Step 3.png
Set a picture as a wallpaper. Click Place Picture..., then in the selection window, browse through the list of pictures, then select a picture and click Open. Then click Set Desktop to change the current wallpaper to the selected picture.File:Change Wallpaper in Classic Mac OS Step 4.png
You may want to adjust the position. Click the dropdown below Remove Picture and choose one of the options:
Tile on Screen - This creates a tile of multiple pictures arranged horizontally and vertically. Recommended for pictures of 256x256 or less resolution.
Center on Screen - This centers the picture.
Scale to Screen - This scales the picture to two opposite sides.
Fill Screen - This stretches the picture to all sides to fill the screen.
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