just wire it as the diagram shows?
Generally speaking as I dont have the benefit of your wiring diagram
battery live (red) goes to your ignition switch
When the ignittion switch is ON this 'Live' appears at the turn relay as a Brown feed,
Out of the turn relay and onwards to the left/right turn switch (Brown/White)
From the turn switch, Left on Dark Brown and Right on Dark Green to the indicator lamp bulbs which have a black wire to chassis or battery negative