Welcome to the forum. I think it’s pretty much configured by default in iodé, but haven’t got my BraX3 handy to check. IIRC there’s only a couple of options?
There’s been some discussion on MicroG in some other threads, but some on very specific things, so a search here should turn them up for you and they might help. e.g. see these two perhaps:
There may also be more information on the iodé OS website & community too? e.g. summary page for MicroG is here:
And the MicroG wiki gives fairly simple install instructions for config (Step 5 is the config part):
P.S. I presume you’ve watched Rob’s video on initial set up of Brax3, he doesn’t go into detail I don’t think but IIRC does cover it… Anyway if you haven’t it’s here (or on Rumble if you want to avoid G):
