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As Michelle said, it's easy to do from the TBR page--click 'add a book TBR' and then just type in the ISBN and add it. I do that all the time with books purchased elsewhere.
But if you were wondering if that specific book could still be tracked by the PBS system once you put it on your shelf...you know how you can click on the little foot icon that's next to books on your bookshelf and see where a particular copy of a book has traveled in the PBS system? I don't think it would still do that, because if you enter a book using the iSBN, the system is going to see it as a fresh copy being posted, not one you received here. Sorry if I'm rambling and not making sense. LOL