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Eric, 10.7.0 and later hide the "Library" folder from you; the Application Support is one of the folders in the hidden one.

If you hold down the Option key on your keyboard and then click the Finder's "Go" menu, though, you'll be able to make it visible.

If it's easier, you can also have OmniGraffle do the searching and installing for you with the following steps:

1) Use the "Windows" menu to open the Stencils window.
2) Click on the magnifying glass in the search field at the top of the Stencils window.
3) Select "Graffletopia" from the menu that appears, then type "matrix" and hit return.
4) Click on "2x2 Matrix" in the results.

You can now download and install the stencil to your Mac right from the window. Hope this helps!