Activating the Persistence Web application once you created your Persistence Web account at Amazon Payments is a very easy process:

If you haven't done it already, start by downloading the latest version of Persistence Web from the link on the right side of the page. You can put the application wherever you like, although most users would typically put it in the Applications directory.

You can now launch Persistence Web by double-clicking on its icon, and you will be presented with the activation dialog as seen below:

Simply copy the activation key provided at the top of this page, paste it into the text field, and click "Activate" to start using Persistence Web!