In order to add indicators in the app please click on any market, then click on the button on the right under the chart. Now you need to click on the "+" button at the bottom and on the next screen you may see the available indicators and enable the necessary one(s) by clicking on "+".
On the web version please choose any market, click on the "Indicators" button above the charts, choose and add the necessary ones by clicking on "+" next to each of them.