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. As blooms fade, snip them off at the base of the stem. Most cineraria plants are started from a seed that is so small it almost looks like dust.
Seed is available on some specialty racks or through mail order catalogs.
This can be the result of being too wet, too hot, too dry or a combination of these conditions. If it seems too dry, soak the roots and see if it recovers in a few hours. If the plant still has lots of buds developing but fails to bloom, this is the result of too little light. If the plant has already bloomed for several weeks, it may just be the end of its bloom cycle. Too much direct sun will produce pale flowers.