So if you followed the names of the folders, those are what you replace. Check the file and make sure it's the same name of the one you're replacing. Once that's done or if you already did it, the FHP one includes a wardrobe file. So those outfits should be in your wardrobe if you replaced yours with the one provided, however it's a pretty old EUP setup and there might be issues with it.
For the Miami one, looks like you will have to use EUP menu to create a new outfit and find the textures you added. After you find them all and have it setup, just save it and it will be in your wardrobe.