DaVinci Duo 2.0a Questions

First off, I am VERY new to this, so please excuse me if my questions are remedial.

I actually have 2 questions:
#1 - In XYZware (I know I know) is there a way to use Extruder 2 instead of extruder 1? (Example: I have white in extruder 1 and Red in extruder 2.  I want to print this object in one color, but red not white.) Or do I have to swap filaments?
#2 - Extruder 2 is dragging slightly over what has been laid down from extruder 1.  is there a SIMPLE adjustment?

Thanks!