Set Primary Screen?

I need help i have installed zorin os 9.1 core and everything works great exept me dual screen setup my primary monitor is dell 24 inch and my secondary is my 47 inch hd tv now my secondary screen is on my left so when i run dual monitor i like to put my primary to the right and secondary to the left i just find it make more sense and it usually work on ubuntu,mint,netrunner etc...But in zorin if i leave as default my primary monitor to the left and my secondary to the right it works but if i try to do my normal set up awn dock goes on my tv monitor and i cant get it back to my main monitor ive looked everywhere and i cant find a fix can anyone help please.
Oh im running amd 15.3 driver and kernel 4.2

Hi, I don't have dual monitor setup but does this help (and yes I appreciate it is a few iterations of ubuntu ago!):

http://www.thegeekstuff.com/2009/08/ubu ... l-monitor/