Click "Add Container" and enter the following.
You will need to add new Vairables for everything except the AppData location which is a path.
You can use the following as an icon URL (visible by clicking the advanced view toggle) - https://hay-kot.github.io/mealie/assets/img/favicon.png
The WebUI can also be changed to your Unraid address followed by port 9926, unless you change this port in the initial step.