Stupid newbie question re ethernet/vs wifi

Sorry to bother the community. I have HA up and running and connected to the internet via an ethernet cable. Generally I like to connect my RPI’s via wifi. I can’t seem to find how to do that. I would expect it to be under configuration, but I can’t find it.
Txs

On the Supervisor / System page in the Host box, click “CHANGE” next to your IP address and select IPv4.

I really would not recommend it though. Wired is much more reliable than wifi and that matters for critical servers like Home Assistant.