Post all your Go! Messenger details here if you want to.
Here's my details:
Important information regarding registration and compatibility
In order to register and succeed in doing it (meaning no looping pages...), use the following page to register: click here
You must then wait for two emails to arrive, one titled "bt.comteam" and then there will be one titled "gomessenger". If you get that your account isn't verified, you need to wait for the second email to arrive in order to login.
You can use Go! Messenger on a PSP of any region, even without an icon in the Network page. In order to do this you must place the contents of the Go! Messenger application within the folder of "PSP\GAME\ULES00856\" and "PSP\APP\ULES00856\" (without the quotes of course). Then go to your XMB and navigate to Game and then the memory stick icon. The application should be there.