First, we identify the trend, the trend will be determined by the daily candles, whenever the daily candle closes above the high of a previous candle the trend becomes positive and the trend remains positive till the time a candle closes below the lowest price of this candle, however, if the cost of any future candle closes above the high of this candle then the bottom of this candle becomes the SL/ trend change point. And vice versa for the opposing side.
Once we have identified the trend we will trade only on the side of the trend in the 15mins candles If the trend is positive then only positive trades will be initiated when the conditions are fulfilled I.e Whenever a 15min candle closes above the high of a previous 15min candle then we enter the trade and if any 15min candle closes below the lowest price of this candle then we SL our trade, once any candle closes above the highest price of this candle then the lowest price of that candle becomes our trailing SL