We recently submitted the app and I am putting some normal screenshots for submission. For that, I need to change those and present them in an attractive way, but there's no edit option for screenshots in Apple Connect. Is there any potential to change it? Also, it is published from my personal account and I need to change my personal name to the app name. Is there any potential to change it also?
Is there any potential to change (the screenshots)?
Not until you submit an app update.
I need to change my personal name to the app name.
That's... unusual :-) The rules for changing your name may depend on where you live and what the app name is. Do you really want to spend the rest of your life called Fart Juggle Pro 1000?
Seriously though - if you want to show something other than your name in the App Store, you need to establish a business with that name and have a business account.