What's going on? (brake question)

I just reached in there and felt around with the tip of the screwdriver till I found something that felt sprind loaded and pushed it a little, then held it there and backed off the adjuster.

Sorry, I don't know how else to explain it.
Maybe you could see more if you used a nice bright light?



That picture does help. makes sense, but I don't see how I am supposed to reach it. The 2 holes in my backing plate are more alligned with the top of the adjster rod. so with the rear end in the way, I cannot get a good angle on the lever at all..no matter what length screwdriver I use..

I literally spent about 2 hours trying to do it..but cannot get the right angle at all to do it.

I'm not sure if there is any sort of tip somebody can give me..but I know that this has to work somehow