I am new to HA, how do I add devices?

It seems to be automatically search devices from same network but how do I add manually devices?

I have Lutron, Legrand and Kasa light switches and two thermostat from Honeywell.

Please help here!

Thank you in advance!

You start by going to the documentation and searching for instance Lutron

Thank you, I was able to add Lutron. I tried to add Legrand but Legrand API is supposed to send me the client_id and client_secret but never received an email from them. Only I can see subscription_key from their API site. Any advise?

No sorry. Maybe start a new topic mentioning them and someone that uses them may be able to help.