Hi @lexifurbush. Welcome to GoDaddy Community!
There are a number of ways to add a forum to your website. Most common is to set up a subdomain and install a forum application like phpBB or Simple Machines Forum. If you have a WordPress site, BBPress is a plugin that you can use to add a forum to it. There are also hosted forum platforms like Discourse. One of those options should work for you. Hope that helps!