How to setup nginx with subdomain only

Hey all,

All of this is very new to me, I’m a junior frontend developer trying to learn more about well everything… and I’ve gotten a bit stuck with nginx as I’ve never used it before.

I have been following tutorials to setup Strapi CMS in a DO droplet and got to the stage of setting up nginx using this tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-18-04

I’ve completed everything upto and including step 4, but step 5 is where I am lost.

When I go to my ip, lets say 1.2.3.4 I get the nginx page, when I go to 1.2.3.4:1337 I get the strapi page and when I go to 1.2.3.4:1337/admin/ I get the log in page.

I have my domain in cloudflare, and have made a sub-domain admin.mydomain.com which takes me to nginx homepage, but admin.mydomain.com:1337/admin and admin.mydomain.com/admin do nothing. What I am wanting to do, is have admin.mydomain.com take me to 1.2.3.4:1337/admin/.

However, I don’t understand the next steps and have searched the questions in here but not found something that helps me. Sorry if this has been asked and I just haven’t been able to find it.