How to add an Indicator On Price – ProRealTime

Hi, hope all is fine with you. May I ask for help? I tried to add some indicators to price chart, but sometimes nothings happens, I cannot understand why. Is there any specific instructions to add? please find this indicator below…if I add to price chart no indicator appears, if I add from the bottom it’s okay..:
/ CCI divergences on CCI
// Use this indicator in a new window

N=40///N is the number of bars to look back for a divergence. Normal values are 20-40. Must be the same in both indicators

miMACD = CCI[14](TYPICALPRICE)

IF (BarIndex > 10+1+N) THEN

///divergencia bajista
IF (miMACD[1]>miMACD AND miMACD[1]>miMACD[2]) THEN
extremum2=miMACD[1]
extremum1=highest[N](miMACD)

preciomax2=close[1]
preciomax=Highest[N](close)

IF(extremum2preciomax[1]) THEN
for i=1 to N
if mimacd[i]=extremum1 then
zz=i

drawsegment (barindex[1], mimacd[1], barindex[zz], mimacd[zz]) coloured(200,0,0)
endif
next

endif
endif

///divergencia alcista
IF (miMACD[1]<miMACD AND miMACD[1]extremum11 AND preciomin2<preciomin[1]) THEN
for i2=1 to N
if mimacd[i2]=extremum11[1] then
zz2=i2

drawsegment(barindex[1], mimacd[1], barindex[zz2], mimacd[zz2]) coloured(0,200,0)
endif
next
ENDIF

ENDIF
endif

return mimacd as "CCI", 0 as "0"