When you first watching / downloading with a device, it will be automatically registered and displayed in the “Manage Devices” section under Settings / My Account on the following platforms: 

• Now TV App/Website (“Manage Devices” is under Settings) 
• Now TV Smart TV Apps (“Manage Devices” is under Settings) 
• Now TV Shop website (“Manage Devices” is under My Account) 

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Each Now ID account can register up to 5 devices at a time^.  If you attempt to play or download content from a 6th device (having 5 devices already registered), you will be prompted to remove a device from the “Manage Devices” before being able to watch or download again. Please note that you can remove your registered devices up to 12 times per year. 
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^Now TV Set-Top Box is not counted as a registered device.  

You are allowed to change your registered devices up to 12 times per year. Once you start using a device for watching or downloading, it becomes automatically registered, and the device registration quota is set to 12 times annually, starting from the date of the initial device registration.  
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For example, if you initially used a device for watching (namely firstly registered a device) on 1 September 2024, you will have 12 quotas to change your registered devices between 1 September 2024 and 31 August 2025. The device registration quota will reset to 12 times on 1 September 2025.

Each Now ID account can register up to 5 devices at a time^, and concurrently stream or download from up to 2 of those. 
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^ Now TV Set-Top Box is not counted as a registered device.  

Yes. The above-mentioned registered devices limit applies to each Now ID account, including the “Multiple User Profile” (each Now ID account can have up to five profiles).  Thus, the registered device limit is shared among all users under a single Now ID account, which allows for registering up to 5 devices at a time, changing devices up to 12 times a year, and concurrently streaming or downloading from up to 2 of those. 
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^ Now TV Set-Top Box is not counted as a registered device. 

You can visit “Manage Devices” section in “Settings / My Account” through Now TV App/Website, Now TV Smart TV Apps (via QR code) and Now TV Shop website, where you will find a list of your registered devices, each with a name such as iPhone, Web, the model of the Android device and TV device, etc. Next to each registered device, you will see a “Remove” button. 
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To remove a registered device, simply click on the “Remove” button corresponding to the device you wish to remove, meanwhile it will consume the device registration quota once.

No, all web browsers would be registered as 1 device, with the device name “Web”.