If you are lucky, it will release after pushing the orange button. If you are not lucky (like me) the cable end and the black plastic piece that stays on the end of the cable will not separate due to heat over time and the two parts slightly warping so they cannot slip apart.
If that is the case, you may have two options. One is to swap the bushing only (a hard push to get the new one out of the new end and into the old end), or cutting the old one off. If you cut the old one off, you may still need to trim the black mating plastic to get the new end to slide on.
Also, if you only swap the bushing, you don't have to fool around with the cable adjustment.
All of this is detailed in those links posted.