trouble with MAME, metalslug 3 and etc..

[Kblader]

so i recently downloaded MAME and a metalslug 3 ROM cuz i love the metalslug series but when i tried to open metalslug, it said it was missing 1 ROM file or a CHD image, but i already downloaded that neogeo bios rom and i putted it into the MAME rom folder but it still doesnt detect it! i dont know what else to do :(

[Kblader]

please, someone help me

[azoreseuropa]

okay... make sure you have metal slug 3 is.. mslug3.zip

and now.. you need neogeo.zip and that is neogeo bios. Please put both into roms folder and run mame32 and you should be able to play it.