Clicking on the Evernote button activates the Evernote window. You can select specific notebooks, to transfer all of the notes contained within those notebooks, or transfer all notes to your iPod. The notebooks appear as Note entries within Evernote. Within each notebook folder the notes are organized by when they were modified (with the most recent coming first).
Note that to access Evernote iPDA needs your Evernote account name and password. The password is securely stored in your Keychain and you need to verify that you entered the correct password (via the Verify button) before iPDA can transfer your notes to your iPod.