1. Open the proof in Spark! if it is not already open.

2. Click the Pen tool in the Spark! toolbar.

3. Left click while dragging your mouse to draw. Once you have the desired line or shape, release the mouse. A comment pop-up will appear allowing you to attach a comment to your new pen line.

You can close the comment box by clicking the minimize button in the upper-right corner. You can re-open it by double-clicking on the pen line.

4. Delete a pen line or shape by clicking on the Delete link in the comment box under the text box.