Serving with backspin

Hi Pingskills!

I am having a very hard time brushing the ball, hitting the ball fast without it going into the net, and utilizing my wrist without missing the ball. I can brush the ball without the table, but I can't apply it to the table. For example when i put all my wrist in to the ball, put extreme force and speed, and attempt to brush the ball, I usually miss. I have been trying to brush the ball for about a year. I still can't get the ball to bounce back toward the net(backspin). How am I suppose to accelerate into the ball without it going into the net. Whenever I try doing this with a open racket, it goes into the net or past the table. Whenever I try doing this with a closed racket, it goes very high into the air. When I use my wrist, the ball hits the edge of my racket.

Thank you,

Toby