Hi John,
More than happy to complete this task for you. I'm fairly new to Freelancer but have been a web developer for a few years now.
Your requirements sound quite simple. Just need to add a jQuery (or javascript) onclick event to the continue button which will fade in a predefined div object.
Happy to forward you a demonstration of previous, similar work with Bootstrap.
If you have any questions or would like to chat further, please let me know.
Kind regards,
Simon