According to this codex page, in order to have multiple blogs you need to activate a 'Network'
In order to active the 'Network' you have to edit a piece of code in the wp-config.php file.
I have tried this and I cannot get it to work and my blog is totally down. It keeps giving me an error page and I cannot get into my control panel.
I would greatly appreciate if someone would post a copy of the edited wp-config.php fragment with more than just the edit line, so I will know what a chunk of the script looks like after editing and what I'm doing wrong. Apparently there are characters that need to be added or deleted and I don't know which ones that is.