Magento

I’m new to Magento, so bear with me on my stupid question:
I could not find any way to upgrade my 1.4.2.0 to 1.5.0.1
I went to the Magento Connect script and there is no place there to update.

I installed a 1.5.0.0 in a different directory, and from there I was able to update using Magento Connect, to 1.5.0.1
But there is no such an option on 1.4.2.0

Any step by step to a noobie?:
Thank you

http://www.magentocommerce.com/wiki/magento_connect_manager_upgrade

Or
http://www.magentocommerce.com/boards/viewthread/219632/#t300429

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