HaloMods "Classic" Read-only Archive

How do i mod the old maps? I got to them via unleashx dashboard and ftp'd them from the D drive to my computer, but how exactly do i like put them back on or something? I tried to do a search about saving them to your harddrvie but nothing really came up. Any help would be really cool. Thanks

You have to put the game on your harddrive and then replace the maps with the modded ones, and only mp will fit on your drive if you have the original harddrive still.