I can't hold the bat normally

I hold the bat like it is in the pendulum serve. When i do that i can't hit the ball backhand and if i hold the bat like normal i can't play so good at my forehand how can i change this ?

Hi Oguz,

Straight after you play the Pendulum serve change your grip back to the normal grip to play the rest of the rally.  If you are doing it right, all you have to do is put your three fingers around the handle again.