Firstly you should unwrap and rinse the stems. Fill a vase or other container with water and mix in the included flower food. Trim the stems and remove any excess leaves or foliage that will fall below water level in the vase.
Carnations do not like direct sunlight, cool drafts, or heat sources such as fireplaces. Cool room temperatures and a clean vase will ensure best results. Remember to change the water every few days.