Before you start, make sure you have created a Kiosk and added people to it. Then pick the device your Kiosk will run on.
The tablet logs straight in to that Kiosk, so there is no need to type a password on it. The QR code refreshes itself while it's open, and the window closes with a green tick once the tablet has connected.
Quick setup only shows for Kiosks that are Available, meaning no device is logged in to them yet.
Open Chrome on the tablet, go to timeclock.kiwi and log in as an Admin or a Manager who can manage the Kiosk. Choose Kiosk when asked where to go, then pick your Kiosk.
These may vary by tablet make and model.