Modification to Channel Indicator

I have a channel indicator that works on MT5. It currently drops the ATR reading from a nominated amount of front candles. Example, we have a 10 candle channel but we want the first three candles not to read the ATR to adjust the channel width. So it effectively sets the channel width on the last 7 candles of the 10 candle channel. The setting can be changed.

I want to edit the indicator so that you can nominate how many candles are dropped from affecting the channel position or angle. Example 10 candle channel however we drop the front running 3 candles and the channel is positioned on the last 7 candles for angular position. 

I want the settings to allow how many candles are dropped. 

However price action is still to trigger on touching of the channel line on Candle 0.

I'm not here to send samples of my indicators so please only respond if you know you can make these edits.