Now I'm going to teach you the B Major scale. First let's take a look at the notes that make up the scale. Those notes are B, C sharp, D sharp, E, F sharp, G sharp, A sharp, and back to B. Now let's take a look at the fingering for the scale.
Starting with the right hand, play the B key with your thumb. When your third finger gets to the D sharp, bring your thumb under to hit the E. Now make your way up the scale with your pinky landing on final B. On the way back down, just do the opposite. When your thumb gets back to the E, cross your third finger over and finish walking back down the scale.
The left hand starts on the B with the fourth finger. When your thumb hits the E, cross over and hit the F sharp with your fourth finger. On the way back down reverse the process, crossing your thumb under when your fourth finger get to the F sharp.