You must be a Premium ZAM subscriber to access the page that gives you the code!
Go to http://www.zam.com/giveaways/turbinepoints.html and click on the link to get your code.
Highlight and Ctrl-C (Copy) the part to the right of "Code: "
In-game, open the LotRO Store
Click on Add Points, then the big button that says "REDEEM MY CARD!"
Enter the code in the field and click on the radio button next to Turbine Points, then submit the code
You will be asked one more time to confirm that you want to apply the code to this account.
And you now have 250 Free Turbine Points that you did not have did not have 5 minutes ago.
Happy Yule, everyone!
Edited, Dec 13th 2010 3:03pm by Bludwyng