You can access the detailed on-line Help at any time using the Help menu item at the top of the screen, the Help button in the Select Game panel, or by using the icon in the Speed/Status Bar at the bottom of each game window.
The Help can optionally be displayed in your default web browser using the provided option in the Options → Other panel.
Please also note that this Tip of the Day panel is resizable using the resize control at the bottom right.