Help...stuck

[Catrin]

I was doing practice drills on my Jamis tonight, things were going well so I decided to try a really tight low-speed turn. Apparently it was either too tight, or I had a bit of toe-overlap, or not enough momentum, or all of the above at the same time - regardless I had a very low-speed and unavoidable fall. I was focusing on not letting my pedals tear my legs up and somehow laid it down with my foot against the RD It appears fine, the problem is in this photo - sorry it is so bad but it is the best one I could get.

The problem is I slipped the housing & cable for the RD out of the guide on my TT, and I can't seem to figure out how to loosen it enough to get it back into the guide. It seems loose enough down by the rear cassette, it is the top part I need to figure out how to loosen. Part of this is fear that I am going to make matters worse if I start playing with the nut at the back of my rear shifter...

Also looking on Google to see if I can find a tip.