i_luv_zelda123

1.You have to either have goku and vegeta (second form), or goten and trunks. Your blast stock meter thingy has to be high, like 4 or 5. It has to be a tag battle. Look on the moves screen. Go all the way at the bottom and it will show you the fusion technique. You push the bottons, wave the nunchuk, or whatever. After that, both players fly on screen and do the little fusion dance thing. Then your players will be fused together.

2. Or are you talking about fusing items together? If so, go to Evolution Z at the main menu. Then you can fuse items together and make characters.