There are many ways to do it.
What server side scripting languages do you know?
Which ones are supported by your hosting provider?
Does your hosting provider offer a drop-in version of what you're looking for (many do)?
Well I'm in a class for website design using Dreamweaver CC 2015 and I will submit the site at the end but it will not go to a hosting provider. But I would like to add some intractability by making it possible for a viewer to post comments.
Thanks, I'll give that a try.