I can issue you a testing account on
Privlyalpha.org or you can change which content server your extension is associated with.
To change content servers:
Go to the options page for the extension to change your content server to
dev.privly.org. The options page can be accessed from the add-ons listing for Firefox.
You can then register for an account at
dev.privly.org and you'll be good to go.
We don't want to make this process too easy while the system is still in alpha so we can reinforce the fact that the system is still in very active development.
Feel free to send follow up emails!