MAME CHEAT HELP !!

[ens04]

i got the cheat file from http://cheat.retrogames.com/ and I put it on the mame directory. I'm playing Ultimate Mortal kombat 3, my question is how do I activate the hidden characters?? i press tab, then go to Cheat, the enable/disable cheats, now what should I do?

[hagbard]

Enable the cheats you want to use, then start the game. Some cheats needs to reset the emulation first, but not usually

[ens04]

how do I activate the hidden characters?? everytime I go to "enable/disable cheats" I see a yellow "set" adn I press enter and it says that the character has been activated but nothing ever happens,I always reset and still nothing

[montpics]

Some of the cheats will work on certain period and some won't. Don't rely on cheats too much though.