4POS uses the Windows regional settings to determine the currency used.
To change your currency from eg. $ to R: Click on Start - Go to Settings - Control Panel - Regional and Language options.
Choose the correct Country and Currency that you wish.
You also need to go into additional settings. Then ensure the decimal point is . (If you are not sure, click on the field & press the . ) also the digit grouping symbol must be , (same - click & press , )
Do the same on Currency on the top.
Click on apply & then ok.
4POS will now detect the new setting.