On your chart the bar around the 1st April is a good example of a pinbar and it signalled a nice move too. But a pin bar on its own is not usually enough to trade. We need to see confluence from other factors that show that it is in a good location. Primarily we look for Price Pivot Zones (PPZs) and also sometimes other factors like divergence, MAs, fibs and things like double tops. There's more of an explanation in the first hundred or so pages of the thread and gems scattered throughout the thread.
The bar you highlighted is a bearish bar and is not typically used as a signal to enter a trade.