Two domains pointing to two different apps on same droplet

So I got an ubuntu droplet with the ghost blogging platform installed on it. I added a domain on the DNS page for the droplet which i can now access and it takes me to the ghost blog. I also added the domain to the etc/nginx/ghost file.

I have now added a node.js app on the vm in the var/www location next to the ghost app and i want to point a new domain to that application. I’m new to nginx and managed servers like this. How do i get the new url to point to the node app.

Thanks for the help.