In the graph we can see the Double Top pattern, a reversal pattern as shown with the red arrows, coming from an upward trend, setting the tops (point A and point B) on the resistance line. The breaking point (point C) is where we should put the short position setting the limit on the size of the breakout range (green arrows). What I recommend to do in this pattern is 2 orders, one cancelling the other depending on the movement of the price of the stock as depicted in the position shown