Why does it say read on one & then on another it just says delivered?

On my iPhone when I'm iMessageing someone it just says delivered on it. But on my friends phone it says read at the time that i read it. And then on her phone she'll be iMessageing another person & it will also just say delivered? So I'm confused on how to get it to tell me when they read it or can i even make it like that?

Go to settings, then iMessage. Slide the button to "on" that says "send read receipts".

That should fix it!