First off I am going to recommend using CLI, or second System Manager 2.0R1 to manage the NetApp, but if you must use FilerView...
If you want to "View" the aggr...
Click on "Aggregates -> Manage"
Click on the aggregate you want to view (i.e. aggr0)
The Aggregate Properties window will appear
If you want to "Edit" the aggr...
Click on "Modify"
Choose the aggregate you want to edit from the drop down list
Click on "Next"
Make the changes you need