Editing an existing item is pretty much the same process as adding an item using the dialog. Choose the item from the list view and press the "Edit" button on the toolbar, or double click an item in the list view, you'll see an Edit Item Dialog which is very similar to the Add Item Dialog. Check out the new item dialog tutorial for details.

You may select multiple items inside a category and press the cross button beside "Edit" to remove these items from your collection.
Alternatively, you may right click in the item list pane, and use context menu options to manage items. Double click on an item will bring up the Edit Item Dialog.

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