They need lots of bright light, but no direct sun. Artificial lights will help. When cinerarias are in bloom, they need to stay consistently moist. Avoid allowing any water to stand in the saucer. As they are developing and coming into bloom, keep them just slightly drier.
Cool temperatures are the key to success with cinerarias.
They do well with average indoor humidity and should not be misted. If you are growing from seed or have a very young plant, fertilize every other week with a water soluble or liquid fertilizer at half strength until your plant starts to set buds. If you have a cineraria already in bloom, it doesn't need any additional fertilizing. Cinerarias grow best in a loose, peat-based potting soil such as Bachman's Exceloam. Because they are actually annuals, once they are in bloom, they will not need to be repotted.