Once buds have formed, Christmas cacti can be moved but the orientation to the light must not change, otherwise the buds try to change direction and drop off. Therefore, buds on plants bought at this time of year are more or less doomed to fail.
Save the plant you have bought this year - it's still an attractive plant without the flowers. Next September, place it where you wish it to flower. This will be just before the buds begin showing. After this point, never turn the pot , keep the same side facing the light.
Feed the plant occasionally throughout the year, monthly is plenty, but stop when you see buds, then just water until flowering is over. I have grown them on sunny windowsills ( but expect some leaf scorch). They thrive in north, east and west facing windowsills.
Moderate watering needed, mine are given a slurp when the surface feels dry. Don't let them stand in water.
Over time, the base stems become woody and ugly. So pull off some younger leaves and push three or four into a pot of fresh compost so that the top half is showing. Usually all the cuttings will take.
A neighbour gave me a Christmas cactus when I was a child, seven years old. Sixty years later, I still have it's descendant growing happily.