I just replaced my old parallel HP Deskjet 540c with a USB Canon S450. Getting the HP working was rather simple. It was a parallel printer and the drivers came with RH 7.1.

However this one is USB and I can't find the drivers in the Printer Configuration window.

Does anyone know how to install a USB printer? I know that USB support in Linux is not quite what it should be.

First check to see if you have USB module load OK
dmesg | grep USB
and dmesg grep hub

You should see some thing

usb.c: registered new driver hub
hub.c: USB hub found
hub.c: 2 ports detected
hub.c: USB hub found
hub.c: 2 ports detected


usb-uhci.c: USB UHCI at I/O 0xa400, IRQ 10
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
usb-uhci.c: USB UHCI at I/O 0xa000, IRQ 9
usb.c: new USB bus registered, assigned bus number 2
hub.c: USB hub found


If you don't see those, you need to see if your hardware USB OK.
lspci | grep USB
will tell you
Your printer port should be in
/dev/usb/lp0
.
Good luck