1. First, double-click the "Adobe Photoshop CS3" icon to open the software.

2. Then in this interface, click the "Magic wand tool" option in the "Magic wand" icon on the left.

3. Then in this interface, point the mouse to the part to be dug, and a dotted line prompt will appear.

4. Finally, in this interface, press the "Delete" key in the keyboard, and the useless parts in the picture will be cut off.