First you need to tap on the special Christmas event icon at the bottom right of your game screen

Then you can find the Christmas Tower on the second tab.

Please take note that you cannot move the building once it has been placed. This is temporary however and when the event is over, this building will be converted into a decoration and you will then be able to move it.

In the event you have placed the building by accident in an inaccessible area of your town, please contact our support team for assistance.