@Ornamental,
That device is on the chain already and that page is used to Add new devices to the exiting chain that device is on. So from where you are – assuming that Android device in the image above is the device which has the data that you would like to get onto your other devices – go to your other device(s) you want on the chain, open them, launch Brave, go to Menu --> Sync, then click I have a Sync code on that device.
Now return to the Android device in the image above. Click Add new device and select which type of device you’re adding – if a desktop, code words will display by default, if a mobile device, a QR code displays by default. Scan this code/enter these code words into the new device you are adding to the chain.