Login Help.

edit

“localhost” is the name of your computer (until/unless you set a better host name). The name to enter is the login name you created during installation.

If you didn't create an account (eg “darrellh”) during installation, you can log in (just this once!) as the special user root using the root password. Then, use useradd darrellh (for example) to create an account, and passwd darrellh to set a (good) password for it. You can also run usermod -a -G wheel darrellh to make it an administrator (wheel) account.

If you were expecting to see a graphical login screen, but are just seeing a black screen with grey text, instead, there are a few possibilities.

If you didn't install a graphical desktop, try sudo dnf groups install "Fedora Workstation" to install the default GNOME desktop. (On Fedora 21, that is sudo yum groups install "GNOME Desktop" for an equivalent effect.)

If Gnome is installed, but not set to start automatically, use sudo systemctl enable gdm and them sudo systemctl start gdm. (The enable sets it to start in future, the start starts it now.)

If Gnome fails to start, you might have trouble with your video card, drivers, et al. Post more details (maybe in a fresh question) if that's the case.