Help with setting up Disk Quota task

[Jeff_322]

I want to set up a new task that emails me when a servers drive reaches 90%. I have created a new task, but on the select systems tab I have choosen to select an event where "event catagory" name "is" "proliant threshold events" and type name is ? (blank)
There is nothing there, the drop down has nothing either and you can't add anything. You can't go on to the next page until something is in the type name box.
Where does the type name come from?