I would phone Accu chek helpline desk and ask them how you can overide the present settings on the meter. If it is set to 1u or 1KE for 10g carb that is as good as useless as many people find that their insulin to carb ratios change according to the time of day that bolus insulin is injected.
Are you using the up/down arrow buttons on the meter to highlight the carb ratio? If you press on the middle enter button that will then enable you to alter the setting by using the up and down arrows.
Are you using the up/down arrow buttons on the meter to highlight the carb ratio? If you press on the middle enter button that will then enable you to alter the setting by using the up and down arrows.