If you have masochistic inclinations you can see the locations of the fill zones (shown in millimeters, out to 8 or 10 decimal places) by opening the *.kicad_pcb file in a plain-text editor such as "Notepad++".
A more practical approach is to zoom in on each vertex in the zone, place the cursor, and read off the (X,Y) co-ordinates from the bottom-most ribbon bar on your display window. I think it's a VERY good idea to condition yourself to make liberal use of the Relative Coordinate feature (activated with the bar).
The "Edit" dialog (or is it called "Properties"?) for each pad allows you to set things like solder mask on/off, fill-to-pad clearance, nature of pad-to-fill connection (you probably want "Solid"), etc. Some of these parameters can also be set for the entire footprint, and for the fill zone - I believe the pad-by-pad settings take precedence, but I'm not certain.