Hi,
The app looks up contacts in the device's Contacts / People app. Normally, those are set up to sync with your device's primary @gmail.com account.
It's possible to transfer contacts (export from AOL / import into @gmail.com), which will make them show on the device and in my app.
The second step, import, is described in Google's help here:
http://support.google.com/mail/answer/14024?hl=enAnd even though Google's help page says that AOL won't let you export contacts, I found it:
1) log into AOL web mail 2) select "Contacts" on the left 3) use the Tools button in the blue "ribbon" along the top and choose "Export" then "CSV".
This should create a file with your AOL contacts, which you can then import into Gmail as described above.