Please note to be able to draw on a map you have to have created a plan within your map. Once created the draw option will become available to you.
The following guidance will show you how to create plans.
Click on draw and select the drawing tool that you require.
When drawing a line, arrow or area if you hold down the shift key and drag your cursor you can create non-linear features.
Once a feature is drawn on your plan you can then assign a use (assigned uses differ based on the template your plan was created on).
Please see the following guide How to assign a use.