To add a Wi-Fi WiZmote into a room, start by making sure that at least one of the WiZ lights of this room is powered on.
Then, from the Home screen of the app, press on the + button in the top right corner. Select "Add device" then "WiZmote".
While the app is searching for remotes, bring your Wi-Fi remote control close to your lights, and press on the ON button on the remote a few times. Your remote should soon appear on the screen.
Once your remote has appeared on the screen, give it a name. All set!