I just bought one of these! First press on, then wait a second for the pan to be detected, then select the burner to turn on, then + which sets it to 5/10, then press + 5 more times for full power! The one with knobs was like double price…but hey the pan heats up quick while you are cursing at it.
It will light up an indicator for each pan detected, so if 2 pans are on the stove you still need to activate the one you want. Assuming you don’t want both on.