Step 1: Open Meitu Xiu Xiu, click on the puzzle, click on the free puzzle, click on the custom background, click on a picture, and add a picture, which is our background picture. Step 2: After adding aa pictures, we need to set the size of aa pictures, click Canvas Settings, enter a custom size of 800*800, and then click OK. The background image has been successfully added here! Step 4: Set the custom size of bb picture, adjust it to the appropriate position and size, and combine the two pictures into one. Click OK to save.