In the current version of the Fedora Installation guide, section 9.16.2. User Creation refers to the possibility of setting up network login during the initial user creation. However, the button is gone in the most recent build of Fedora 19 beta. Find out what's up with that and if necessary remove section 9.16.2.1. Authentication Configuration, which details the procedure for setting up network login during the installation.
https://bugzilla.redhat.com/show_bug.cgi?id=965883
The network login section has been removed in commit 7b7ee382f503acddda75607afabb5d41fbced276. Admonition pointing this change out added in commit 6ce96daa2fb998b9be5bc09e2497c18727cfa09b.