Check /etc/httpd/conf/httpd.conf or one of the config files in /etc/httpd/conf.d/ for a DocumentRoot declaration and adjust it to the directory where your pages and other http files are.
DocumentRoot directive
Syntax: DocumentRoot directory-path
Default: DocumentRoot /usr/local/apache/htdocs
Context: server config, virtual host
Status: core
This directive sets the directory from which httpd will serve files. Unless matched by a directive like Alias, the server appends the path from the requested URL to the document root to make the path to the document. Example:
DocumentRoot /usr/web
then an access to
http://www.my.host.com/index.html refers to /usr/web/index.html.
There appears to be a bug in mod_dir which causes problems when the DocumentRoot has a trailing slash (i.e., "DocumentRoot /usr/web/") so please avoid that.