I only see App Store on settings, not Itnues

In iOS 11 and later versions, Apple removed the "iTunes & App Store" setting from the Settings app. Instead, they split the settings for iTunes and App Store into separate sections.

To manage settings related to the App Store, you can find them under "App Store" in the Settings app. And for iTunes settings, you can access them through the "Music" or "TV" (depending on the iOS version) section in the Settings app.

This change was implemented by Apple to streamline and simplify the settings organization on iOS devices.

The iPhone 8 Plus runs iOS 11.0 or later. So if SravanKra is correct about the changes that Apple made to the Settings user interface, starting in iOS 11, the changes he mentions would apply directly to you.