can't find dns etc

It sounds like you are trying to have your AX work as a router to provide wireless internet access?

If so, open airport utility (as you did when you set it up for airtunes), select your AX from the window at the left, click manual setup, click on the internet icon at the top of this window, and fill in the details (whether you connect via PPoE, etc etc).

Come back with any specific questions about setting it up, but I read your question as a question about getting started at setting it up. My apologies if this is incorrect.

H

PPoE only requires the login name and password for your ISP. If you have been connecting to the internet in the past, you will have them somewhere.

Let me know how you have been connecting in the past (maybe via a PC plugged directly into a modem, maybe via a Mac wired to a router etc), and I'll (hopefully) be able to tell you where to go and look for them - but if it is via PPoE, it will likely only be a login name and password (usually supplied initially by your ISP) that you'll need.

H