If you see your files under "unassigned", they have probably been imported. One pretty good way to find them is to go to the Left Navigation Pane and find Playlists > SmartLists > Audio - Recently - Imported - This week .
That should show you everything you imported this week. Below that in Smartlists, you'll see other Recently lists that might help also, like last 100 tracks. Once you've found your tracks, you almost certainly need to Tag them with Album, Artist, Song title (which we call Name), etc.
You can just type it in, if it's only a few tracks. Or you can try to automate it a bit more if you have a good number of tracks. One decent way to automate it, is to have JRiver look at the file name and directory name and try to pull out the Album, Artist, and Song names from what's in the file and directory names. Choose some files and then right click and go to Library Tools > Fill Properties from filename. You can try the automatic mode and you might get lucky. But you'll probably need to fill out a template instead, which tells JRiver which parts of the file and directory names correspond to Album, Artist, etc. Here is a fairly long and detailed forum posting which includes a good discussion of the Fill Properties tool:
http://yabb.jriver.com/interact/index.php?topic=78206.msg531771#msg531771I warned you, it's a long one.
The question that comes to my mind is why your WAV files aren't tagged at all. WAV files don't support tags very well, but they normally support the absolute basics. Personally, I wouldn't use WAV files at all because of their poor tag support. If you have a choice in the future, opt for a more standardized lossless format like FLAC, or even ALAC. AIFF as a last resort. All 4 of those formats have equivalent quality with FLAC and ALAC having the best tagging support. FLAC is recommended a lot around here.
Let us know how you do. Good luck to you.
Brian.