Q: I can not figure out where on my computer the option is to transfer the files from and SD card plugged into the printer onto my computer. My printer is a lexmark 5400 3-in-1
A: Hmm. Have not worked with the lexmark. If lexmark is smart then you will see the windows picking up the SD card when you insert it in the printer. Then you can explore and go into the SD card. Otherwise you just have to access the picture files from the printer LCD screen and print it.