Trying to set the index for the list and the tutorial I'm watching is several years old. I'm trying to figure out how to set the index to 0 so that it starts reading from the first string. How do you do this in GML nowadays?
Depending on your keyboard layout, 0 is usually the key left of the 9.
If you're not asking how to type a 0, then it's not really clear what your question is. I see that you've posted a screenshot, but that doesn't explain what you're asking very well. There is no such thing as "the index for the list". You read the value you want to read. If that's the first value, then... the 0 is the key to the left of the 9.