HT1351 Got a used 4th gen nano, but i need to sync it. i can see it but i cant figure out how to authorize it

Question

Got a used 4th gen nano and I need to sync it with my library on my computer. I can see the ipod but i cant figure out how to authorize it

Answer 1

You don't need to "authorize" it, unless you are trying to sync content that uses DRM (copy protection).  You probably just need to set up syncing.
First, if the iTunes sidebar (along left side of window) is hidden, from the menu bar, under View, select Show Sidebar.  The iPod appears in the sidebar, under DEVICES, when connected.
Select the iPod in the sidebar.  The iPod's Summary screen is shown to the right.  Toward the top, there is a bar of buttons, starting with Summary.  Click on Music to the right of Summary.  This Music screen is where you tell iTunes how to sync songs to the iPod.
Check the box for Sync Music.  If your iTunes music library is small enough to fit on the iPop's storage, you can choose to sync Entire music library.  Otherwise, choose to sync Selected playlists, artists, albums, and genres.  From the lists below, select what you want to sync the iPod.  One convenient way to set this up is to create one or more playlists in your iTunes library, and put ALL of the songs you want on the iPod on those playlists.  (Or you can use existing playlists.)  Back on the iPod's Music screen, select (checkmark) those playlists under Playlists.  You can also select other items on those lists, as desired.
When you click Apply, iTunes syncs the songs in your selections to the iPod.  Going forward, to update the iPod, just update those playlists in your iTunes library (add/remove songs).  The iPod does not need to be connected.  The next time you connect the iPod (or click Sync if already connected), iTunes updates the iPod with the same changes automatically.