Dynamic textbox

I am trying to write a paragraph ( its for school project ) and i am using dynamic textbox and variables. I linked a button with

on(release){
textbox = " … "
}

to target my textbox, changing its text. The only problem is, I am trying to write an essay type format, which has several paragraphs within it, and if i have enters within the code, it screws up, like the example below.

on(release){
textbox = " first paragraph.
new paragraph goes here."
}

Could anyone tell me how i write in the dynamic textbox to allow it to have paragraph indents and spacing. thx!