After you get the stand out of the base might want to check to see if you have some grit in the base that is causing your problem. If no grit might try taking some very fine sandpaper to the bottom of the stand so it'll slide in and out easier.
First turn the black collar at the pedestal floor base, counter clockwise. This unlocks the collar by raising it upward. Then, turn the pedestal counter clockwise and lift it upward out of the floor receptacle.