Instead, it's recommended that you create theme and edit the CSS there so that updates to the theme will be inherited instead of destroy your changes..
You will see the theme will be child-themed, but will track the theme correctly...
Extract all files from ZIP file, making sure to keep the file structure intact, and then upload it to wp-content plugins.
Go through the steps for installing and running the plugin above to create theme.
Select the in the drop down on the right, click Select and make sure you editing the file style css ..
If for some reason it didn't default to the right theme, go into Appearance menu and re-enable the parent theme..
Instead I offer the ability to repair the Child theme or copy template files from the parent into the child for editing...
Also, this plugin strikes the right balance of features, is free, and, I've been adding volunteers to support it.
Even if I sucked into the vortex of management again this plugin will in the hearts and minds of bloggers everywhere..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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