Dont know the variety of this guy but it was given to me when it broke off in shipping. Now I have dried it for 3 days and dont know what to do now.
I don't know what it is, but to try to root it, put the cut end shallowly into some moist cactus soil and leave it for a while. Keep the soil moist, but not wet. Many cactus are very easy to root this way.