Hi!
How can I connect 4 motors like this shema : http://www.irit.fr/~Nicolas.Lassabe/diagram.jpg
(look just wheel 1 to 4)
And a LCD Screen like this schema : http://www.skpang.co.uk/projects/arduino_lcd/lcd_schematic.PNG
Wit the LCD library you can choose what pins to connect the LCD to, so just choose different pins to wire it up to in the second link. Then change the pins in the LCD begin statement. I would use pins 11, 10, 9, 3, 2 for the LCD but you can also use the analogue pins as digital pins, A0 being pin 14, A1 -> pin 15 and so on.