How to backup applications on my iphone 4s with itunes?

How do i backup applications on my iphone 4s with itunes?

With iCloud. Just plug in your phone and iTunes should pop up. Look for something called iCloud and click on it. It's a virtual storage for all your files on your phone.

Plug in your iPhone to computer with a USB cable, after the iTunes recognize your iPhone, go to the iPhone summary tab, you will see a "backup" option, that's what you need.

You don't. You use icloud

File > Devices > Backup