Notification Services Update Not Working

Hello,I'm following the tutorial for setting up notification services, available here:  ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/sqltut9/html/44aa0556-b9c2-48f5-8775-134bbe0b90aa.htm.  Where it says:Update the Instance of Notification Services
After you modify the ADF, you update the instance of Notification Services to add event class objects to the application database:

In Object Explorer, expand Notification Services.
Right-click Tutorial, point to Tasks, and then select Update.
In the Update Instance dialog, click Browse, browse to the TutorialICF.xml file, and then click Open.
In the Parameters grid, enter values for the _ServerName_, _DBEngineInstance_, and _InstancePath_ parameters. Use the same values you used to create the instance.
Click OK.
Review the Notification Services - Update Summary dialog box, and then click Update.
When the update actions complete, click Close.
I'm getting the error:  The instance must be disabled before it can be updated or upgraded.  How do I do that?Thanks.