What are the steps to reload my MacBook from a Time Machine back up on a external HD.

Before I upgraded my MacBook to Lion I first used Time Machine to back the OS using a external HD. Not being satisfied  with the Lion OS
I want to revert back to the Snow Lepopard. What are the steps to reload my laptop from my external HD?

I tried this but my external drive is not appearing for some reason. Although it is accessible through finder.
Is ther perhaps another way of doing this??
Your help is massively appreciated!!

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