New Centos 7 install local endpoint down

Hello,
Complete new user here. I’m trying to setup a VM for docker on my ESXi 6.7 homelab. Primarily for trying out some home media type services like Emby, Plex, etc. I built a basic Centos 7 VM and installed docker just via “yum install docker”. I then followed the instructions on the Portainer web site to install Portainer. I have went through the initial setup wizard to create an account and select the local endpoint. But, when I login to the interface the local endpoint shows as down and I can’t figure out how to get it to work.

What am I missing to just use Portainer to manage a single local docker install?