1. Use image editing software, such as Photoshop or GIMP, to open the take-away corner mark image, and open the take-away image that needs to be added with corner marks.

2. Secondly, in the image editing software, select the option of "Add Layer" or "Create New Layer" and drag the takeaway corner image onto the newly created layer.

3. Finally, save the modified takeaway picture and upload it to the takeaway platform, so that the customer can display the takeaway corner when ordering.