How can I control stepper motors using labview?

I have an Arduino uno and Adafruit motor shield for 2 steppers. What code do I need to load in order to control it from Labview using Arduino palette

You need code on the Arduino that can receive and parse message from Labview - see Serial Input Basics

And you need code on the Arduino that can control the stepper motor based on the data that is received. These links may help
Stepper Motor Basics
Simple Stepper Code
also look up the AccelStepper library website.

If you are new to all of this I suggest you start by writing separate programs to learn how to do each part separately.

I know nothing about LabView.

...R