You'll need the McDonald's App, so download it here and create an account if you haven't already.
Once you have the app downloaded and opened, just look for the McDonald's Gift Drop promotion and use one of the following codes to enter: P4PY2, D7TQ9, VSRSN, LXB32.
You can enter once per day, per account. Each gift tag code can be used multiple times, but you cannot re-enter the same code the next day (so you’ll need to enter a different code in every day).