My Iphone does not indicate Wi Fi Sync, how do I install it on my iphone

The setting for WiFi syncing directly on the phone no longer exists. I know it has not been a feature in the phone settings for quite a while. You have to initiate and set up syncing from iTunes on your computer and that includes syncing over WiFi.

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Use iTunes to sync your iPhone, iPad, or iPod with your computer - Apple Support

If you have a Windows laptop open iTunes and connect your phone to your computer. Click on the Phone icon in the top bar of iTunes, then check the box for Wi-Fi sync. After checking it click Sync or Apply (whichever appears in the lower right corner).

For Mac OS Mojave or earlier the process is the same. For a Mac with Catalina or newer the phone will appear in the Finder sidebar (if it doesn’t go to Finder menu/Preferences/Sidebar and check all of the boxes). You can click of the Wi-Fi sync button there and then Sync or Apply.