Need help with uploading

I got this error:

Arduino: 1.6.8 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 1,066 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 "\.\COM3": Access is denied.

Problem uploading to board. See for suggestions.

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

Many posts on this message board with this same error.

The PORT was not selected to COM5: Arduino Uno, which caused the problem with uploading. I selected the correct serial port and it worked.