If you never modded using traditional methods (modding using files instead of mod manager) then here is a short walkthrough on how to do so

Method 1: this is the fast and easiest method.

Step 1: download the mod (link: https://www.nexusmods.com/fallout4/mods/37990 )

Step 2: unzip the folder

Step 3: open steam

Step 4: right-click fallout 4 and click on properties

Step 5: open downloads folder (or wherever you saved the mod at) and look for the mod

Step 6: drag and drop (or copy and paste) the unzipped mod to the data folder.

Note: a plug-in for the replacer (even if you didn't use mod manager) a plug-in for the mod should appear in mod manager if you did it right.