With annotations, you can add handwritten notes and drawings to your slides. Students will be able to see the annotations, but they can't draw on the slides themselves.
Click the "Brush" icon to start or stop drawing mode.
Start drawing by clicking on the "Pencil" icon.
You can choose a colour by clicking on the "Pipette" icon.
With a mouse, draw by holding the left mouse button down and erase with the right mouse button. On a touchscreen, you can draw by touching the screen. To erase, touch and hold for half a second, then move to wipe away previous drawings.
Don't forget to save your annotations using the "Save" icon.