writeable blog directory? what if I don’t have a directory?

Okay In the readme.txt file I need to varify something……okay look at the instructions Below:

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== Installation ==

1. Upload the full directory into your wp-content/plugins directory
2. Make your blog directory writeable OR create two files called sitemap.xml and sitemap.xml.gz and make them writeable via CHMOD In most cases, your blog directory is already writeable.
2. Activate it in the Plugin options
3. Edit or publish a post or click on Rebuild Sitemap on the Sitemap Administration Interface

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Where it says to make your blog directory writeable, what if your WordPress is at your root (–I hope I said that right–)

Thanks,
Providencebooks