how to wire up a bt plug?

Answer 1

You will find 6 wires and they should be wired as follows
terminal
1 green/white ring
2 blue/white ring
3 orange /white ring
4 white/orange ring
5 white/blue ring
6 white/green ring

Answer 2

The following web site shows how to wire a plug and socket.
It looked pretty informative to me.

Answer 3

The "A" wire (white or predominantly- white/blue) goes to pin 5, and the "B" wire (red or predominantly-blue/white)goes to pin 2. Cut off and ignore the unused wires.