The Comments Debug view shows all comments in the task along with the step number for each. You can use this list to quickly jump to any step of the task for which you've created a comment. You can also use it to add, modify, or remove comments.
In the Comments debug window, right-click the comment and click Jump To.
Right-click anywhere in the Comments debug window, and then click Add.
Type the comment in the box.
If you want to place the comment at the end of the task, select Add to bottom of task. Otherwise the comment will be added to the beginning of the task.
Right-click the comment, and then click Modify.
Enter the modification and click OK.
Right-click the comment, and click Remove.