went right to overdrive, and installed their app. IT WORKS. I have to read the books right on overdrive, but at least they are separated from my own books anyhow. And I can justify keeping this instead of taking it back and getting a "just ereader"
I couldn't get Aldiko to work with library books anyhow, don't know why, but I was able to get some of my other books from my computer onto it. So I don't know what I did wrong.
Still having lots of trouble putting books onto my ereader via MicroSD. The instructions they gave me work up until the download is done. Then it says there was trouble.