You can - but on the charting page not the Stock Report page. The small chart on the main Stock Report page is designed as a quick overview rather than a full technical charting resource.
If you click the 'chart' tab at the top of any stock report page, you'll find the full Technical Analysis Charting package. You can change the defaults on the chart to your own preferences. We provide a range of technical indicators including Moving Averages, Bollinger Bands, Stochastics, RSI etc. You can also choose Candlestick charts, Line Charts, or OHLCcharts.