How do I use this library?

Okay here is one for you... I just realized this is in the window at the bottom of the Ardiuno IDE when I upload the code.

C:\Users\Jim\AppData\Local\Temp\arduino_modified_sketch_772442\HelloWorld.ino: In function 'void setup()':

C:\Users\Jim\AppData\Local\Temp\arduino_modified_sketch_772442\HelloWorld.ino:14:31: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

   vfd.write("1234567890ABCDEF");

                               ^

Sketch uses 1304 bytes (4%) of program storage space. Maximum is 30720 bytes.
Global variables use 96 bytes (4%) of dynamic memory, leaving 1952 bytes for local variables. Maximum is 2048 bytes.

But it still uploads. This happens when using this:

#include <vfd_vaf1613.h>

//adjust these according to your wiring:
const byte clockPin = 7;
const byte dataPin = 5;
const byte resetPin = 6;

VFD_VAF1613 vfd(clockPin, dataPin, resetPin);

void setup() 
{
  vfd.init();
  vfd.power_on();
  vfd.write("1234567890ABCDEF");
}

void loop() {
}