How do I get rid of "access privileges" popup message?
Source.

Use Restrictions to disable access to the iTunes Store and it shouldn't ask you  anymore.


  Using Restrictions in iTunes on your Mac or PC, you can turn off
  access to:
  
  
  Podcasts
  Internet radio
  iTunes Store and iTunes U
  Apple Music
  Apple Music Connect
  Shared libraries
  



Open iTunes.
Mac: From the menu bar at the top of your computer screen, choose iTunes > Preferences.
Windows: From the menu bar at the top of the iTunes window, choose Edit > Preferences.
Click the Restrictions tab.
Select the items that you want to disable and restrict. You can also set rating levels for movies, TV shows, and apps using the menus to the right of these items.

If you want to make sure that other people can't make changes to your restrictions, click the lock icon in the lower-left corner of the window and enter the administrator password for your computer. If you later want to make changes to what you disable or restrict, click the lock icon and enter your password when prompted.
Click OK to confirm your choices.