To use one of the drawing tools, you need to create a marker first and position your playhead on one of them (you can use the "previous/next marker" buttons in the timeline controllers).
You can also choose a color and set the size of your brush before using them.
Simple pencil. Click and drag to draw on screen
Click the picture where you want to add text. A pop-up window appears where you can type anything.
Click and drag to define the ending and starting point of the line.
Click and drag to define the ending and starting point of the arrow.
Define the size of the brush. Num + and Num - keys can be use to quickly
Click and drag your move over strokes, texts, lines or arrows to delete them.
Undo you last stroke
Just press Ctrl+Z to remove your last stroke.
P : Pencil tool
T : Text tool
I : Line tool
O : Arrow tool
C : Color selector. Define the color of the next created marker or current used tool
E : Eraser
Num + : Brush size up
Num - : Brush size down
Ctrl+Z : Undo you last stroke