Many mods from the regular modding sites usually come with installation instructions. Have you tried checking those?
This. Because mods are not officially supported at this point, it is very important to read the mod's readme file because it is not very straightforward process at the moment
I should add this to my to-do list. Modding will be supported and the forums exist (which I know for certain as I created them, in case anyone needs confirmation) but are just waiting to be green-lighted. Which isn't my decision and is on hold as long as the EA feedback is prioritised. But just throwing that out there so it's known to be a thing.
But in the meantime I should probably collate some information about the how, why, why not and so on. People want to know how to install stuff and should know the consequences of doing so.
