It is written in the description of the template :
Dashy helps you organize your self-hosted services, by making them all accessible from a single place.
-Before you start CLI unraid
mkdir /mnt/user/appdata/dashy/
wget -O /mnt/user/appdata/dashy/conf.yml https://raw.githubusercontent.com/Lissy93/dashy/master/public/conf.yml
-Edit conf.yml
You will have to open the terminal to do so.