For AirStash firmware 1.x:

(Screenshots attached)

1. Make sure you have the latest version of either Pages, Keynote, and/or Numbers (1.5 as of 12/17/2011).
2. Connect your iPad to your AirStash via WiFi.
3. On iPad, launch either: Pages, Keynote, or Numbers.
4. Go to the Documents/Presentations/Spreadsheets view (where you can select which document to edit).
5. Tap the "plus sign" at the upper left of the screen, then tap on "WebDAV" to show the pop-up window.
6. If you are signed in to another WebDAV server, tap the "Sign Out" button.
7. In the "WebDAV Sign In" pop-up, enter the following:
   • Server Address: http://airstash.net/files
   • Leave "User Name" blank
   • Leave "Password" blank
8. Tap the "Sign In" button

Each iWork app needs to be set up using the method above.

Additional Reference showing how to use WebDAV after setup: http://support.apple.com/kb/ht4283