I can't sync my iPod to entire library

Question

My husband had the first iPod.  We shared an email address.  When he died, I gave his iPod away.  I had been able to sync mine early on, but now I can't add new content or sync the content of the main library.  I'm still using the old email account.  My computer recognizes my iPod, but my iTunes account shows two separate playlists.  The main one with new podcasts won't sync.  I can't figure out how to add new content to the playlist for my iPod.  I can play all the content on the computer.  How can I change settings so I can use the entire library?

Answer 1

The setting for syncing the entire music library is on the iPod's Music settings screen.  If your entire iTunes music library can fit on the iPod, you can use it.
Select the iPod in iTunes, so that you see its "management" screen.  I don't know if you have the latest iTunes (version 12) installed, or if it's an earlier version.  If 12, there is a sidebar (along left side of window) on the iPod's screen.  In the sidebar, under Settings, click Music.  If it's an earlier version, there is a bar of buttons starting with Summary.  Click Music next to Summary.  That is the iPod's Music settings screen, where you tell iTunes how to sync songs to your iPod.
Near the top, there is a box for Sync Music.  Check that box to enable automatic syncing, if it's not already checked.  NOTE:  If that box is not already checked, the iPod is currently set to manually manage content.  If you change to automatic syncing (by checking that box), content on the iPod will be replace by content from your iTunes library.  Any songs on the iPod now that are not in your current iTunes library will be lost.
Below that setting, there are two options for how to sync.  To sync your entire iTunes music library to the iPod, choose the option to sync Entire music library.  When you click Apply, iTunes syncs your entire music library to the iPod.  Going forward, changes to your iTunes music library are synced automatically to the iPod, the next time it is connected (or when you click Sync if already connected).
If your entire iTunes library is too large to fit on the iPod, you can use the option to sync Selected playlists, artists, albums, and genres.  Please reply back to get more info...  or about using the manual method to load content on the iPod.