Streak Entry and Exit related query


I am having query for Buy and Exit in streak. What options I should select if I want to

Buy when LTP crosses Previous Candles High

and Exit on LTP crosses previous candles low.

How to select LTP price. Wants to use this on Heikin-Ashi cadles.

One more query is when I am selecting time for entry and exit from 9.30 am to 3.00 pm. In back testing it is showing results in 9.15 to 9.30 also and exits after 3.00.