Attempted to tweak the .GTN hasn't worked could someone help me?

HI All

Attempted to tweak the .GTN hasn't worked could someone help me out with the changes .

My .GTN FSX Steam Edition

GTN_750_1.DEFAULT]
; show screen only gauge if true.
nobezel = false
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; display mouse tooltips if true.
tooltips = false
; enable mouse clickspots if true, disable if false.
usemouse = true
; enable alternate click-spots (left CCW, right CW, middle Push) if true.
usealtmouse = false
; enable touch beyond screen bounds if true (2D only), clip if false (GTN native).
extendtouch = true
; auto-resize dimension (width,height)
refsize = 
; left mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225) (requires SHIFT+left mouse button).
popleft = 
; right mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225).
popright = 
; adjust brightness (0 to 100)
brightness.bezel = 100
; offset brightness (-100 to +100)
brightness.screen = 0

[GTN_750_2.DEFAULT]
; show screen only gauge if true.
nobezel = false
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; display mouse tooltips if true.
tooltips = false
; enable mouse clickspots if true, disable if false.
usemouse = true
; enable alternate click-spots (left CCW, right CW, middle Push) if true.
usealtmouse = false
; enable touch beyond screen bounds if true (2D only), clip if false (GTN native).
extendtouch = true
; auto-resize dimension (width,height)
refsize = 
; left mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225) (requires SHIFT+left mouse button).
popleft = 
; right mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225).
popright = 
; adjust brightness (0 to 100)
brightness.bezel = 100
; offset brightness (-100 to +100)
brightness.screen = 0