To play the whole scale up and down, start with your first finger, then play the next note two frets up with your fourth finger. On the next string, use your first finger to play the note a fret lower than the starting note.
The next note is two frets higher. You can shift up and play it with your second finger, or play it with your third finger and then shift up a fret afterwords. Play the next note two frets above that with your fourth finger.
After that, the next note is under your first finger on the next string, at the same fret you started on. From here the pattern repeats. You can also start with three notes on one string and two on the next, the reverse of this pattern.