How do I use drawing tools on my mobile device?

Drawing tools can be added by tapping in the chart, followed by tapping on the drawing tools chart menu:

Now select the type of drawing tool you would want to add:

Now tap and hold in the chart where you would want the drawing tool to start followed by tap and holding the end point. The drawing tool will become visible:

When you tap and hold the drawing, two dots will become visible and can now be modified, both in angle and length: