When you install it, it will ask you for an id.
Make one up, along with a password you'll remember (hopefully), and click "Ok" (or whatever the button is).
If that id is already taken, you'll have to pick another one or modify the one you have. You could try "toonton." If it's already taken, try "toonton007" or something and see if that's taken.
You don't get an id ahead of time; you pick one when you install it and run it.
Let us know it that answers your question.