Hi,

Thank you for posting to our Forum. Please note that this is the English forum; for Chinese communication, please head over to our Chinese forum.
您好，感谢您的帖子。本平台为我们的英文论坛；中文沟通还烦请您前往我们的中文论坛平台。

The activation window should appear on the first launch.
Alternatively, you can access it from the Help menu:

You can also manage activations from the website here: https://my.aximmetry.com/User/ManageActivations

Warmest regards,