The Network Details heading on the Create a Network page has options filled in automatically. The server address, for example, is pulled from your installation and isn't editable. The network title and administrator e-mail address are pulled from your installation database, too, because your initial WordPress site is the main site in the network. Clicking the Install button causes WordPress to create new network tables in the database. The page refreshes and the Create a Network of WordPress Sites page appears, as shown in Figure 2-3.
From the Create a Network of WordPress Sites page, follow these steps to install the multisite feature after you install the network. Note: These steps require that you edit Web server files, so be sure to have your text editor program handy.
In your WordPress installation directory is a folder labeled /wp-content/. In that folder, create your new directory, which stores all the uploaded media (photos, videos, audio, and other media) within the network sites on your domain. The entire path should look similar to /public_html/wp-content/blogs.dir.