In PhotoShop, there is a special interactive Palette Options. In the Options palette, you can adjust the settings for any instrument, with each instrument will have its own set of parameters. To set a specific tool you must first select it in the tool palette. Then gain Options palette set the options settings for the selected tool.
Options Palette at the top of the window Photoshop, immediately below the main menu. Palette can be moved around the screen, but it is better to leave it in place. In earlier versions of Adobe Photoshop deployed Options panel in the form of a floating palette, but now, this palette is nice.
Here is an example of how the palette looks like this for Brush Tool:
You can enable or disable the display palette Options using the Options item in the menu Window.