2015 Mazda3 Infotainment Questions

I have the 2015 madza 3I sport hatchback non bose system. I have the NVX XLCA2 | 2-Channel Line Out Converter with xBOOST Technology and it includes the Remote Bass Knob. The car has the infotainment radio on the back and it has 2 plugs ,1 white and 1 blue which has the speakers wires for the front left and front right for pos/neg.
 
Yes sorry, need help trying to Add a loc to my stock infotainment radio with the non bose system. I can't find the wire colors for the left and right side to tap in to...