When the presenter enables the multi-user whiteboard, all users in the BigBlueButton session can annotate the whiteboard simultaneously.
Once the presenter has engaged the multi-user capabilities the whiteboard controls will appear to the right hand side in the presentation area.
By default the Pencil  tool is enabled; you can use the other whiteboard controls to change the Thickness  and Colour  of the line.
To draw on the presentation select and drag the mouse button to draw a line.
You can Undo last annotation  made or Clear all annotations  while the multi-user whiteboard is enabled.
It is important to note that once the presenter turns the multi-user capabilities off they can clear the whiteboard marks made by others when it was enabled.
Select the Pencil to display the other available whiteboard tools, which include:
- Text input 
- Line 
- Ellipse 
- Triangle 
- Rectangle 
- Pencil [default]
- Pan/pointer 
To write on the presentation, select the Text Input  tool and draw a rectangle. The rectangle will be the text area.