Start your letter with a personalized greeting from Santa himself. Write "Dear" and your child's name.Write a personalized response to the child's letter and sign it "From Santa. " Insert both letters into an envelope, and address it to the child. Get a personalized letter from Santa for your child! Browse our template gallery for an example of how to write a letter to Santa. Feel free to ask Santa about his reindeer, elves, or life at the North Pole. Keep your questions kind and curious. An example of a properly addressed letter. Fun fact: any child who drops off a letter to Santa gets a surprise from BuildABear!