how to make this autotrend channel into ea

dear all

how to make this autotrend channel indicator into ea

i always use this indicator in my manual trading

indicator

AutoTrendChannels.ex5

simple rule 
buy at lower bands/line ( exit the sell order )
sell at upper bands/line ( exit the buy order )

in my experience -
in case bands get wider after open order - option to add more order if equity enough