Hi @Kobus Bosman. Thanks so much for sending the video - it was super useful!
If you've added more questions (or statements) after question 31, then you won't see the "submit" message there. Instead, the "submit" button will appear when it's the last question of the form (you can test the preview page to see how the last question will look like).
You can reorder the questions and leave the phone number question as the last one. This way, the button will show "Submit" and the respondent will be sent directly to an Ending.
I believe this is what you were aiming to do, but please let me know if I misunderstood your request or if you have any further questions. =)