How do you delete a fetch request in XCode 4?

I'm a new user of the data model editor in XCode 4.  How do I delete a Fetch Request which I don't want?  It was difficult to figure out how to add one (click and hold the "Create Entity" button!).  But now that I've created one, I can't for the life of me figure out how to get rid of it.
I'd also appreciated pointers to a good tutorial on building predicates.  eg something which answer how do you test if the year in a date attribute == something.

You'd think I would have tried that.  Select the request and then do Edit->Delete offers to delete the entire data model.  I always thought the Delete key and Edit->Delete were equivalent.  I guess not.  Thanks.

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