Generally speaking, plants bought from a store or nursery are grown in compost (potting soil) that suits their needs, otherwise they wouldn't grow well and wouldn't sell. Unless the plant is unhealthy or pot-bound (the pot is so full of roots that a mass of them encircles the soil-ball), there is no need to disturb it, in fact changing the compost is likely to do more harm than good.
If the plant is pot-bound (if so, you can often see roots growing through the drainage holes, or water runs straight through the compost, without really wetting it), it will have to be moved into a slightly larger pot. Water the plant very thoroughly, place the base of the plant between your fingers, turn the pot upside down or on its side and give it a sharp tap. Gently remove the plant and tease apart the roots that are encircling the root-ball, but without disturbing its overall structure; the aim is to keep the root-ball intact. You can then transfer the plant to its new pot, using a compost that contains some of the ingredients in the old one, e.g. if the original compost is peat-based, and the new one you are using is soil-based, add a little peat, so as to ease the transition and encourage the plant to grow into the new medium. Just place enough of the compost at the bottom of the new pot and fill the gap around root-ball, again without disturbing it, and then water thoroughly.