You must enter a new key after 90 days. These are the steps. First of all you register and you give your email address. After few days creator of Smartpls send you the an email with username and password. After that they send you a second email with the activation key. After that you can login and you can click "my key". There is a very detailed video. Here is the link

http://www.youtube.com/watch?v=ivRj5a3bttc

Hope it helps. Good luck.

去网上注册一个就行了！我已经有了

到底怎么才能得到那个key啊！我都申请n次了，只能收到一封邮件，谁能帮帮我啊！万分感激！

我也是。。。

That youtube clip is deleted. Could you share the same information with some other click or source?