Iterator

I'm trying to do some tests with the Iterator but following the examples I've found, something seems wrong with my account since nothing shows up as an option to Choose Array. I've set up a Text Formatter to enter the array values as shown in the first image and then whether I save or refresh, nothing appears as an option to choose for the iterator. What am I doing incorrectly please?

Nothing is wrong with you account. You are using the iterator incorrectly.

In text formatter you need to turn of the Simple Response toggle and they click on save and send test request. That will give you the array to use inside iterator.