How do I make text change more than once?

Okay, so I want to create a simple dialogue but I can only set text to change the text once after pressing the enter key(return) How do I create more than one???

I think it Needs to be defined better,

but say u want to Display a Long text in small steps , then u can do something like :

Variable x = 1

If <Return> pressed : display text ( x from Array ) // set variable x = x + 1