I think this video is pretty self explanatory. All you have to do is play a continuous chromatic scale without ever breaking the flow of semitones, without any restrictions in terms of fingering or direction on the fretboard. This means you are free to move up, down, diagonally, shift position on a single string play diagonally, as long as you move a semitone (= a fret) up or down. The goal is to have a very even sound no matter what you decide to do. This will give you a more improvised approach to your study of technique, much closer to a real playing situation. After you got the concept and you feel comfortable with the exercise, get the metronome out, and challenge yourself to play this faster, or longer, without making mistakes.