I have an electric range with digital display that is showing dr and I can't clear it off

Maybe you can unplug and plug in again to clear the panel to start over again and reset.

I believe that is referring to the door latch.When is is displayed in means defective door latch and indicates replacing it. Does the self clean, bake and broil work on your unit? If not it would be due to the latch. If everything is working and it is displayed, it is just a false display. Then like tickle says you may try unplugging for 15 sec to reset. Good Luck