After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
Move the main folder of the mod to assets/mod_overrides. The assets folder is supposed to be in your game's installation folder (don't know where that is? click here for PAYDAY2 folder). Create the folder if necessary
Put the Brave Frontier Mods folder into your Payday 2 Mods Folder.
Put the Brave Frontier Override folder into your Payday 2 Mod_Overrides Folder.