Try this thread:
If you don't know your IP address, in Windows (on your PC.) choose start, type "cmd" in the search box, type "ipconfig" in the DOS window. The ip address you need is the one labeled "IPv4 Address".
In aldiko, tap "store", tap menu (horizontal bars in upper right corner), tap "my catalogues", add new catalogue for calibre using instructions in link, for library, use the library url to the sign-in web page. To authorize ADE go to the settings menu but for the Aldiko home screen.