To bloom a Christmas cactus, you need to provide it with proper light and temperature conditions. Place it in a bright location but avoid direct sunlight, as too much direct sunlight can burn the plant. Keep it at temperatures between 50-70 degrees Fahrenheit during the day and 40-50 degrees at night. Water the plant regularly, but do not overwater it. It's also important to fertilize the plant every two weeks during the growing season. Following these steps should help your Christmas cactus bloom in no time!