With the pen tool, you can add freehand drawings to the board and remove them if need be. The tool will work well with the mouse and will become an irreplaceable part of your tablet workflow.
Click the Pen tool or press P on the keyboard, select size and color, and start drawing by holding down the mouse button and dragging the cursor.
To delete a drawing, switch to the Eraser and swipe across the drawings while holding down the mouse button.
Drawing with the Pen and Erasing a drawing
You can also select drawings with the Select tool, and erase them using the Delete key on your keyboard.