To edit a protocol, check the small box on the left side to highlight the step you would like to edit. You can change the values in any or all of the fields: Step #, Voltage, Gradient, Current, Time, and Units. The arrows signify a pull-down menu. You also have the option to Add Step Above, Add Step Below, Delete Step, or Delete All via the buttons along the top. Once you have finished, you can save your protocol.