Yeah, it's pretty bad how Fedora, and worse, RedHat, seem to forget about the terminal in their documentation. Actually, cups seems to have forgotten as well.
The command is lpadmin. The man page is lacking somewhat. If it was a really generic laserjet, running on a network, at an address of 192.168.1.50, that you were going to call HPLJ
lpadmin -p HPLJ -E -v socket://192.168.1.50 -m laserjet.ppd
The ppd is given in relation to /usr/share/cups/model, if I remember correctly.
Anyway, if you google around for lpadmin, you can, possibly get the instructions when combining it with the man page.