Select InternetShopper and you will see three entries relating to each service individually. Next select the service you wish to update, for example, SMTPD and you will see all the keys listed in the right portion of the display.
We will add an entry for "mailbox0" with the contents "MBX:brian brian root". Select the menu option Edit: Add Value and a dialog will be displayed. Enter the value name, in this case "mailbox0" (without the quotes) and make sure that the data type is "REG_SZ" (this means zero terminated string). Press OK and you will be asked for the contents of the value - enter "MBX:brian brian root" (without the quotes) and press RETURN. You will see your new value displayed on the right portion of the REGEDT window.
To change a value, simply double click on the value name on the right hand side and a dialog will be displayed asking you to edit the value. When you press RETURN your new entry will replace the old one in the Registry.
Be warned that you could do lots of damange to the system if you go around changing values indiscriminately! But then what's new?