http://r53zi7kxyqd72fuvhztzi25fo2bze7fqjefze7k6t6kiq74pzaq5suyd.onion/posts/2025/openbsd.html
But I always used an external adapter. Unfortunately, the one I had is broken, so my only option is using RNDIS (the "USB tethering" option) from a phone. In my case, it worked just fine. OpenBSD is great as a server OS, having all the things you need to get started, it's not as great as a desktop OS.