Q: how to delete unwanted apps from itunes

What do you mean delete from iTunes? You can't do that on an iPad. You can delete apps in iTunes on a computer. If you want to delete an app on the iPad, tap and hold down on the icon until the icon wiggles, then tap the  X appears on the icon to delete the app. Tap the home button when finished.

You really need to explain in more detail what you wNt to do. Maybe this will help.

How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store - Apple Support