Editing All Text PNG

I have created a PNG file that is all text. Currently, it is wider than it is tall. I want to edit the text so that it is taller than it is wide, and can't find out how to do that. Every time I try, the cursor moves up and down the text, but I can't edit the position of the text itself. For example, if I wanted to change the oriebntation of this post, I could select the point at which i wanted the line to end for each group of text, then hit "enter" on the keyboard, to make it look like this:

I have created a PNG file that is 

all text. Currently , it is wider

than it is tall. I want to edit the

text so that it is taller than it is

wide, and I can't figure out how

to do that.

I could continue, but I think you get the idea. How do I change the orientation on my PNG file?