Where is the aoss button on the PSP?

There is no AOSS Button on the PSP, it is something on your router.

You have to have a router that supports it. This router is hooked up to your computer and is around a $100.00 but you have to have DSL or something like it to run a phone line though. If you do not have this you can go to a Holiday Inn or Wal-mart parking lot who has this router hooked up already. You can access to the internet there. I know this sounds crazy but try it I did. and it works.