Roche CoaguChek XS Manuel D'utilisation page 39

You can exit the meter setup procedure at any time (e.g. if you have
made an incorrect entry) by pressing the On/Off button
the meter setup again by turning on the meter with the Set button, and
press the Set button repeatedly until you reach the setting you wish to
change.
If you do not wish to perform
a test at this point, turn the meter
off.
Meter Setup
. Then enter
39