trullingerWordpress really does have excellent documentation, but I've seen a couple questions relating to installations on Yahoo hosted sites. I'm by no means an expert, but I put together a really simple guide (adapted from an eHow article) that's intended for non-technical users who are hoping to upgrade.
http://trullingerphotography.com/blog/upgrading-wordpress-using-yahoo-hosting/
Hopefully, this will clear up how to edit the wp-config file for folks who are new to website editing.
