Styling The Comments

Hello.
I’m not new to wordpress, I usually find ways to edit my website, but now i’m really stuck. I’ve been wanting to edit my comments that has already been posted. Where am I bringing this? Well when someone has commented, it says “[name] says: And well I would like to change that to; Dear melissa; And at the end there would be the name of the person who commented. I know exactly where the code is when I look in my source file. But that always changes from the editing. Is it possible to even do this?