Trying to install Discourse on portainer but it's not pulling the base container

How do I deploy it on portainer though. A touch new but i’ve managed to get linode and portainer and nginex proxy manager setup. Looking to install containers for apps that’ll hold subdomains for our marketplace

We’ll be using discourse for our commuity

I used this totorial I used: https://youtu.be/7oUjfsaR0NU