Draw text incrementally

I have a game developing that has text dialog boxes popping up, thanks to the tutorial by The Indie Station, but i cannot figure out how to get the text to display incrementally. That is, i want it to appear as if the text is typing, not just all drawn at once.  I have only been using Stencyl for a few weeks, so I am probably missing some obvious approach.

Check out the Dialog Extension by Justin. It does the whole RPG-style, letter-by-letter typing really well. It's very versatile and customizable.

i have been unable to install the extension for some reason. and since i have a sufficient system in place, i was hoping to add this function to it.

for 1 line, you can use this:

https://gyazo.com/35cf9f5fbc4721d22bc9f3e41e35576b

However, things get more complicated when doing multiple lines, or when you also want to remove the characters one after another

Thatll be a great start, either that or til i can get Diaolg Extension working properly. Thanks!