On the chart we see price has broken the trendline and hit its key support level where it was rejected - It is a key level as we can see multiple rejections on the chart if you look further back
It then retraced to the trendline and was rejected again
Once price has broken support we can look for sell entries to the target shown on the chart
It then retraced to the trendline and was rejected again
Once price has broken support we can look for sell entries to the target shown on the chart