Grab a participating package of milk (it will have the "Milk MOOves You" logo displayed)
If you have a participating jug of milk...
The MILK code is found on the back of the jug label.
Most labels have a tab at the bottom of the label that you can peel to reveal your code. Or, look through the spout when the jug is empty to see your code.
If you have a participating carton of milk...
The MILK code will either be on the top of the package (next to the best before date) or on the side of the carton.
Check the RULES for no purchase entry requirements