The Options  Bar, by default, runs just below the Menu  Bar.  Whenever a Tool is selected in the Toolbox , the Options Bar displays the available options for the currently selected Tool (note, see previous example).

Select an option by {Clicking} on the option.  Some options are buttons; others include drop-down menus or input fields.

{Clicking} the Brush option for the Airbrush Tool  presents the user with a drop-down menu from which a brush shape and size can be selected.

Options  for the Crop Tool  include input fields for Width, Height, and Resolution .

The Options  have been input by the user.

The options for each Tool are discussed later in the manual.