Only displaying a certain amount of a program on a monitor.

I'm trying to make a message board that displays people's message but I only want a certain amount of the program on the screen. I just want what the player says. Not what it asks you to input.

I would also like it to re-ask(or loop) straight after I finish the program.

can you post your code?
For the loop you can do:

function prompt()
  message = read()
  prompt()
end

I didnt really get what you mean by "what the player says, Not what is asks you to input."