Ek code chaheya sir

Mere ko bollinger band ke upr kaam krna hai lekin bollinger band ki value 20 candles k bad aani start hoti hai . Toh asa code btao ki mere ko bollinger band ki value 1st candle se he mil jae taki agr meri condition 1st candle pr be fulfil hoti hai toh muj signal milna chaheya