Is there a way to turn this off after every text message sent? it shows up and a green dismiss button on screen and annoying me with the pop up

I'm assuming you are on O2 pay as you go. If so you can call customer services and ask them to switch them off

Are you on Giffgaff? If so, you can log into your account from a computer and go to the phone settings and switch it off.

I'm on O2.