To use, follow the breakout wiring on this page for the PN532 breakout board https://learn.adafruit.com/adafruit-pn532-rfid-nfc/breakout-wiring
To wire up the OLED, wire 5V to vcc, GND to GND, SCL to A5, SDA to A4 on the Arduino Uno.
Then flash the code onto the device, and tap an ISO14443 Card to the reader