Help on Arduino/ Won't let me upload my sketch to the Arduino

I got this error or on my Arduino, looking for help
Don't mean to sound like a complete newb(Which I am)

But what does it mean by program storage space? storage space of my computer or the Arduino?

Arduino: 1.8.5 (Linux), Board: "Arduino/Genuino Uno"

Sketch uses 1126 bytes (3%) of program storage space. Maximum is 32256 bytes.
Global variables use 11 bytes (0%) of dynamic memory, leaving 2037 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
Problem uploading to board. See Arduino Help Center for suggestions.

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

Please do this: