Morning,
I've done a full install video on this very subject, although for my E89 it is the same position for the microphone as the E93 (top of the steering column).
Here's the video, if you jump to 20:39 I run through how to remove the panels and how to connect up the wire....
Hope that helps.... in fact the whole video may be of use to some of you thinking about fitting one of these, well except for removing the other panels etc but that's covered in many other YouTube videos.