To play bump, I just press the B button and I guess you are trying to get the bar as long as u can to get more power when u go back to back with another character and push them. And to play heading: move left and right by pressing the A and the C buttons (a for left, c for right) When the ball comes down, press the B button to bounce it back in the air.
HERE IS A TIP: don't wait for the ball the hit your head.... press the B button before it comes down to far or it will hit u and u will lose. You want to jump up to bounce it.
