1. A method of controlling a medication delivery system that is used to deliver medication to a patient wherein the system includes an electronic controller and at least one control button for controlling an amount of the medication to be delivered to the patient, said method comprising the steps of: providing a removable overlay label including a first set of explanatory indicia; at least partially covering a second set of explanatory indicia with the provided removable overlay label; selecting the amount of the medication in accordance with the first set of explanatory indicia on the removable overlay label; locking the system such that the selected amount of the medication to be delivered to the patient is unable to be modified; removing the removable overlay label to reveal the second set of explanatory indicia; and operating the system in accordance with the second set of explanatory indicia.