How do I make captions like in a story?

This question should be closed because it is too broad and vague. And you didn't even try to make captions. Next time when you are asking a question, you have to try to solve the question yourself. Anyways, let's get to the answer.

You can schedule a GUI to pop up at certain times in your animation. This is just a snippet of a script you need to make this work.

function caption(lol)
    script.Parent.Text = lol
end

script.Parent.Visible = true
caption("some loser: Your fists are about as strong as a mosquito's!")
wait (2)
caption(" [Japenese] Kenshiro: Omae wa mo shinderu...")
wait (2)
caption(" [Japenese] some loser: NANI?!")
wait (1)
caption("some loser: You must be joking!")
wait (1)
caption("so yeah this is why i hate anime lol xddd")