help to do video on modelling character

following the video tuts on this character

and on vieo #10 where he begins adding some driver for one of the bone

i got a problem that when i add a driver for the first bone jaw-L

it does not work like in the video i can see driver beign added but when i try in graph editor to add armature then the bone name cin seems to be there?

so how is this possible and to correct this ?

but on the right i dont see the violet field under the list of shapekeys!
for the value in mauve !