alright, call me an idiot but for whatever reason, when I enter zero g's in the third chapter, I cannot figure out how to walk up the wall or even fly down to the ground. Perhaps this is because I took a very long break from this game and I am still getting used to the controls (again). I'm playing on an xbox360 platform.

Any help would be great.

Aim your weapon where you want to jump to, and press Y. You can't jump to all surfaces, and you can't jump if there are solid objects blocking your path (Pillars, Platforms, etc.).