Installing Docker and containers Flint 3 4.9 firmware

[skywizard]

I think I have installed docker correctly using Application /Plug-ins.
Do I need to add another plug-in?

I can see Docker in Luci :-

I now wish to add a Container SearXNG but it does not appear :-

I am familiar at adding containers in Portainer/docker on a RasPi but I cannot seem to be doing it correctly in the Flint

I have made the Firewall entries:-

I do see there are no options for Docker Configuration:-

Do I need to do something else....