Possible To Configure Wifi Adapter in RetroArch without Project Eris?

I’ve seen Project Eris-specific guides on how to configure SSID, etc, which seem work when RetroArch is launched from Project Eris. But the config file is within Project Eris. Is this not a RetroArch native feature? Should I install Project Eris 1.0.0 after all? It doesn’t say whether it has RetroArch 1.8.5 or 1.9.0 on the website and I do like my PSC being vanilla when nothing’s connected (Or is the PE menu only visible when external media’s connected?).

I put Project Eris on another card. To my liking, the PSC was still appeared vanilla without it. Had RetroArch 1.8.5 I believe. But PE won’t detect my TP-Link (TL-WN725N) adapter, which was supposedly confirmed to be compatible. Or maybe it’s a bad card.

So retroarch.cfg has this line, wifi_driver = “null”. There are Linux drivers at https://www.tp-link.com/us/support/download/tl-wn725n/ . I’m not sure where to begin on running Linux commands on the PSC to compile it if that’s what’s needed. Advice?