Problems with Installation - MacBook Yosemite.

Whenever I attempt to run "Blink," the example program, I only get errors.

Here is my main issue:

Arduino: 1.6.4 (Mac OS X), Board: "Arduino Uno"

Sketch uses 1,030 bytes (3%) of program storage space. Maximum is 32,256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "/dev/cu.Bluetooth-Modem": Resource busy
ioctl("TIOCMGET"): Inappropriate ioctl for device
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

I can't really find what's wrong.
I apologize in advance if I'm being difficult, I'm just kind of confused.

Thanks!!

"/dev/cu.Bluetooth-Modem" is a serial port used for communicating with a bluetooth modem. It is NOT your Arduino. An Arduino UNO will have a serial port name that looks like: "/dev/cu.usbmodem1411". Do you have an older Arduino with a FTDI USB-to-Serial chip or an Arduino clone that uses a CH340 USB-to-Serial chip? If so you need to find and install the drivers for it.