Place in bright shade. Coral vine does lose its top during freezing weather, but it's rather surprising yours did not return from the roots. The white is root-hardy, too, but difficult to find. It is not listed in the above catalog. I find it only at special plant sales.
Coral vine likes sun but tolerates partial shade.
It does not require much water once established. Kalanchoes are short-day plants, and they flower only when they have less than 12 hours of light each day. Kalanchoes like bright, warm locations and a porous soil mix. A sand and humus mix is good, or you can buy a cactus and succulent mix at a garden center. Water well, then let the plant drain.