Oki CX2731 - Using [BS] on the Screen Keyboard; Using the Backspace Key on the Qwerty Keyboard

32 – The Control Panel
CX2731 MFP Basic User’s Guide
Using [BS] on the Screen Keyboard
Press the right or down arrow key to highlight [BS], then press OK to
delete the last character entered.
Using the Backspace Key on the Qwerty Keyboard
Press the backspace key to delete the last character entered.