Copy the folders MODS and USERMAPS.

Go to: C/Users/USERNAME/AppData/Local/Activision/CoDWaW/

(USERNAME will appear as your PCs name.)
(If you can't find the appdata folder, change your windows settings to show hidden folders and files.)
(If you don't know how, you can google about it. There are surely lots of guides on it out there.)

Paste MODS and USERMAPS there.

Go back to the downloaded files of the mod.

Copy the folders MAIN, MODS and USERMAPS.

Go to: Your COD WAW root game directory where CoDWaW.exe is located.

Paste MAIN, MODS and USERMAPS there.

Start the game and select the mod from the mods menu.

You are ready to play.

question I have is, will I get banned from plutonium for adding custom levels (sry if my question sounds stupid but I don't want to be banned)?
ty in advance