Good news. I found my library's guide for using Digital Editions (
http://chinookarch.cantookstation.co...tartup_kobo_pc ) and was able to download an eBook from my library and sync it to my device.
[Overdrive on my Kobo still has no idea what my account is, but given that I can hardly type on the device, it wouldn't be super helpful to browse for books from there, anyway.]