The mirror is mounted on a spring and ball breakaway mount. You can remove it by grasping the stalk and pulling down. Replace is a bit more difficult, needs to be perfectly aligned with the grooves in the header. If you would like to be more elegant, try rocking it to one side or the other and get a small bladed screwdriver in between the ball and groove and release it that way. Personally, I like the gorilla technique.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.