Assuming you followed the steps chromb posted and the beatmaps are now inside your Songs folder. Try pressing Fn+F5 on the beatmap selection menu. Or just restart the game. Both should cause your beatmap list to refresh, which is needed if you moved the files into your Songs folder with the game open.
Otherwise, can you share some screenshots of the beatmaps in your Songs folder or share some more details about the steps/process you followed?