1. Let the readers type their name

I'll show you how to let the readers type their name. Let's get started! ☺
First create the character with name YOU.
Go to your first episode, this is my example:

INT. BLACK - DAY

@YOU enters from left to screen center

NARRATOR
So.. what's your name?

input What's Your First Name?|What's Your First Name?|DONE (FIRST NAME)

NARRATOR
Wow, [FIRST NAME], that's an incredible name!

2. Let the readers customize their character

Then we'll let the readers customize their character. (This only works for Ink)
First, in the first episode, we click into "Script Templates". Click to INK FEMALE AVATAR (if your character's male click INK MALE AVATAR).
Well, there'll be an error. In the "Hair" choice, they put "@YOU starts primp" but it's not right. You click CTRL + F, a box will appear, click "All", then write another behavior. Example:

@YOU starts blow_kiss

Yeah, like that. Well, this chapter ends here.
Next episode we'll choose the outfits for character.