The cable that goes from the accelerator pedal to the throttle body is in a plastic/rubber sleeve and goes around the back of the engine. Follow that to the back of the engine at the top. Thats the throttle body. Where this ends and wraps around the "D" shaped part, thats what you want to twist.
Correction. its not at the back of the engine, its on the right hand side of the engine. ( i was getting mixed up with my mrs golf.)