I'm assuming this is the data sheet: Cytron.io - Simplifying Digital Making
Hook up humidity and temperature pins to analog pin 1 & 2.
You can print out the voltage of the 2 pins by this code:
void loop() {
Serial.println(analogRead(1)); //prints value recieved from analog
//pin 1 over serial
delay(1000); //delay 1 second
Serial.println(analogRead(2)); //prints value recieved from analog
//pin 2 over serial
delay(1000); //delay 1 second
}