I have ventura 13.6.6, I can't find my iTunes icon and want to get this program back--how do I do this?

Note that the iTunes Store is not featured as prominently in the Music application as it was in the iTunes application. But it is still there. To see it, you need to go into "Music > Settings" and check off "Show: [X] iTunes Store." Then it will appear in the sidebar of the Music window.

There is no iTunes application in Ventura.

Apple split up the iTunes application as of macOS 10.15 (Catalina). Some of its functions are now in the Music, TV, Podcasts, and Books applications. Others having to do with manual synchronization are in the Finder.

There used to be a Support document about the change, but the link now just takes you to an online user guide for the Apple Music application.