If you're using a keyboard, it requires too many buttons to be held down at once to work. Use a gamepad, and you'll be fine.

thank u so much for your reply... i figured it out sort of but its very very hard i cant do it with just my controler i have to make the block buttons assigned to the keyboard to do it. cause for some reason on the snes version for the pc it dosent let u hold block and run down at the same time without the keyboard so even moves like smokes invisible u have to let go of block instead of holding it down and being able to turn invisable im wondering why this is... has anyone else noticed this for other emulators than mame if so please help or let me know