The button row can be used for using file functions. You can use them by clicking with your mouse or by using the function keys.
These functions are :
F3 - Show - Show selected file F4 - Edit - Edit selected file F5 - Copy - Copy one or multiple files F6 - Move - Move one or miltiple files F7 - MkDir - Create a new directory F8 - Delete - Delete selected file F9 - Help - Show this help