Primulas are grown for a bit of spring colour - much like a pan of tulips or daffodils and not to be a long term houseplant. Fortunately a lot of them are perennial in this are so once it is warm enough, you can plant outside in a sunny spot and you may be lucky enough to see it bloom again. In the meantime, they like bright - not direct - sun, to stay evenly moist - but not overwatered as the roots still need to breathe, and a cooler location. This should prolong the blooming period. When the blooms are done, gently remove spent blossoms. Wilting can be both a sign of over and under watering - so adjust accordingly. As with most houseplants, if using tap water, it is always a good idea to allow the water to sit overnight to allow chlorine and fluoride to dissipate before using on your plant as both can cause toxicity. Enjoy!