The signal appears when a hystogram located above the zero line changes its descending direction to the rising.
The «A» column should be above the "B" column and can have any color. The "C" column (signal) should be green.
The signal bar is the bar the signal column is formed at.
Once the signal was formed we place the pending order Buy Stop higher than the signal bar by one pips. The very last signal "saucer" for buying cancels all previous ones (do not forget to delete the pending orders after the signal is changed).