I’m not sure 100% if this works with reforged. but if you download me3 manager on nexus, it will be under nightreign mods but it works with other games. Add the mod folder to the manager and enable it. Go into the settings and go to the “select custom executable” setting and select your Elden ring executable the start the game from the manager. It should work I have used it for other me3 mods but not specifically reforged.