kodi isnt doing what it did before..

I am totally new to this so be gentle.. I installed kodi on retro pie and got it up and running just fine, I added my network drive where my tv shows are kept, and kodi can acess them just fine , however I cant figure out why kodi isn’t providing the box art for the shows like it had the first time I pointed at this source.. I did have to re install kodi and retro pie to start over again.. how do I get kodi to scrape for the tv shows art and stuff again? I also would like to know how to remove a path for a source I have added.. ( I have 2 of the same sorce names on my list and only need the one.. I had tried to repoint the computer at the drive again, and that’s how I got 2 of the same sources listed)