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Once it’s successfully scanned the QR code a confirmation message will appear – tap Link New Device.Now hold up your phone and ‘scan’ the QR code on your Macs screen with the camera in your smartphone.
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If Signal hasn’t already asked for access to your devices camera, it will now.Scroll down to the Linked Devices option and select it.Open the Signal app on it and then select the Settings ‘cog’ icon (see screenshot below).
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