First, copy the picture as a spray picture, and the pixel should not be higher than 5 12*5 12. If the pixels are wrong, you can open the picture, click image-property and set it to 5 12*5 12 pixels.
Then paste the picture you just copied, and then stretch the point in the upper right corner of the picture until it just covers the white background color. Save it in JPEG format, the file name is English or number (the path must also be English or number), open the game, and import the screen in multiplayer online to use.