@Dan-Reyes sorry to hear you're having issues.
I will preface this with the simple fact that you did get NodeBB working, and it's nginx that's giving you trouble. Nginx is sometimes difficult to get right, especially if you do not have experience with it.
So let's break down the steps. You want NodeBB working with Nginx but nginx is giving you a blank page.
Firstly, let's get your latest configs, can you paste your nginx config (for NodeBB), and your NodeBB
Secondly, you want sampfive.me or forum.sampfive.me?