I downloaded and installed the Nook Android app from the Google play store. Unfortunately when I click on an ePub book, even one that I downloaded from the B&N Nook store, my Samsung Galaxy Tab 2 10.1 displays an error message stating that it cannot find an app to run the file.
If I run Nook first, I can open files by clicking an icon in its list of books. Unfortunately that *only* lists epub books that I downloaded from Barnes & Noble, not any of my other books. (I have ePub books I bought directly from Baen, for example -- no joy.)
I'm a complete novice with the Android O/S and have no prior experience with any smartphone or tablet whatsoever. I'm quite familiar with Windows (up through 7) and several Unix/Linux flavors. Also somewhat familiar with MacOSX (but not iOS). This *has* to be an easy fix, but I've spent about three hours in mortal combat with the tablet and am getting nowhere. What did I do wrong/not do?

I'm a complete novice with the Android O/S and have no prior experience with any smartphone or tablet whatsoever. I'm quite familiar with Windows (up through 7) and several Unix/Linux flavors. Also somewhat familiar with MacOSX (but not iOS). This *has* to be an easy fix, but I've spent about three hours in mortal combat with the tablet and am getting nowhere. What did I do wrong/not do?