You will need administrative access to update code groups. To get started click on the Maintenance tab. Then click on Codes.
Choose the code group you would like to update:
Once you select the code group you would like to update you will see the list of your current codes. The top line will be blank:
Enter the new code in the top three boxes (enter the same code in all three boxes) i.e. New Code, New Code, New Code. Choose the load order (the load order refers to the order of the drop down box in the file) and then click Update.
Once you have updated you will see your new code listed.
If you need to remove a code select the little square box on the right of the code. Then click update.