my pc tells me I have overdrive app,, but can not find it.
What sort of Nook do you have? If a Nook tablet, you should be installing the app on the device itself. If a simple Nook, you actually need to install Adobe Reader on your PC, if you don't have it already (free download here: http://www.adobe.com/solutions/ebook/digital-editions/download.html). This link might help: http://help.overdrive.com/customer/portal/articles/1481624
I hope this helps a bit--please feel free to call us at any branch of the library. For the main branch, call 402-444-4800.