Put 4 AA batteries into the battery holder, make a path, and turn on the robot. If the robot does not work check soldering carefully. Now you must adjust potentiometers to robot be able to detect black and white areas. Turn all potentiometers to leftmost position then turn back about 90 degrees to the right. Hold the robot on the line, move it over a turning if the motors state does not changed change the potentiometers value. Now put the robot on the path to follow it.