This is not meant to be a troll post, but just sincere curiosity. From the site "My full name is Micah Elizabeth Scott, but I used to be Micah Dowty prior to Fall 2010. My friends call me Beth." How can a woman who used to be a man can have a vagina? is there some kind of surgery? do you keep your sensitivity to be able to use vibrators?
The short version: They form a vagina in the pelvis and reuse the head of the penis to form a clitoris. The urethra is also rerouted. Caveat: I am nothing more than a layperson on the subject. My short version may be wrong, and there may be other surgeries available.
The longer version: Wikipedia [1] has quite a bit of information on the subject. Use incognito mode if you must; I've always found it to be a fascinating subject.
[1]: http://en.wikipedia.org/wiki/Sex_reassignment_surgery (No images if you're worried about that.)