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Click on the Apple in the top left-hand corner. Click "About This Mac" A box will appear saying "Mac OS X" and then underneath it will be the version, if it says 10.6.x then you have it.
 
Good question, you go to the apple logo on the top left of the menu bar and click on it, then go to about his mac it should say os 10.6
 
First mac I've ever own.. how do i see if the OS is Snow Leopard?

If you've just bought it brand new, it's snow leopard.

If you are this insecure about it, click the apple logo on the top left, click about this mac, the version of mac os X should read 10.6.x (x being either 0, 1, or 2)
 
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