You will not find a separate account portal or download link for iMessage; the feature is toggled on within the native "Messages" application. Without these foundational requirements, the registration steps will not be available to you.
Configuring iMessage Send and Receive Settings for Optimal Use
Activation synchronizes your Apple ID with your phone number or email address, telling Apple’s servers that you are ready to send and receive encrypted messages over the internet. Network and Security Considerations For iMessage registration to complete successfully, your device requires an active internet connection.
Locate the "iMessage" toggle switch at the top of the screen. Finally, ensure that your device is not blocked from communicating with Apple’s servers due to a firewall or carrier restriction.
Configuring iMessage Send and Receive Settings for Proper Registration
Verifying a Successful Setup Once registration is complete, the interface within the Messages app will change subtly. You can add email addresses to the "Send & Receive" section of the settings menu.
More About How to register in imessage
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