1. Open the top of the hive.
2. Find the cluster.
3. Remove empty boxes above the cluster. (If you have boxes of honey above the cluster, then you don't need to feed. Only do this if there is not enough honey left to survive the winter).
4. Place a paper towel on the top bars right above or on top of the cluster. Those shorter sheets work well because three of them are about the size of the box.
5. Pile sugar on the paper towel. If bees are flying, you may want to moisten it. I recommend not doing this until well into winter so bees aren't flying.
6. Place an empty box on the top of the hive around the sugar. The shorter the box the better. My favorite is the bottom three inches of a box sawed off a deep box to make a medium. But a medium or shallow or even deep will work.
7. Put the lid on.
8. As needed, open the top, lay down another paper towel, and pile more sugar on. The bees will only use what they need.
9. At the end of winter, remove chunks of sugar and store for reuse next year.