var days = 10; // use the value of a custom field...
var date = new Date();
date.setDate(date.getDate() + days);
var dateString = date.toDateString();
var dateElement = document.createElement('div'); //you could use an existing element instead
dateElement.innerHTML = dateString;
document.body.appendChild(dateElement);
What you want to do is custom and since you don’t code and unique things need to be tweaked for your use case you might want to hire someone to get you across the finish line.
Thank you for the quick and constructive reply Jeff. Code makes rudimentary sense to me. Appreciate the help getting started and yes I’ll look at hiring.