Can I run the arduino without usb?

Subject~~ help ... :frowning:

Yes. You need to supply power, either through the barrel jack or (regulated, 5V) the Vin pin.

PaulS:
Yes. You need to supply power, either through the barrel jack or (regulated, 5V) the Vin pin.

The Vin pin goes to the onboard 5V regulator. You have to feed it at least 7V to get regulated 5V out of the regulator.
Regulated 5V goes to the "+5V" pin.
The barrel connecter is preferred because it has a diode to protect against reverse polarity.