Q.When Do You Take A Christmas Cactus Out Of Dark Time
When do you increase watering and how often do you fertilize a cactus. I have had this plant for 3 years and it has never bloomed. So I followed your suggestion to put it in dark cool place. I now have little pink buds a
On leaves about 1/8th to 1/4 big.

Certified GKH Gardening Expert
Now would be the appropriate time to bring it into increasing daylight hours. This will help it to finish flowering.
Feeding can be done with an all purpose twice per year, granular. You can also feed once per month with a liquid feed, instead of twice per year with granular.
This article will help you to care for it, now that it is time to bring it out: https://www.gardeningknowhow.com/ornamental/cacti-succulents/epiphyllum/epiphyllum-plant-care.htm