You should avoid having Zenario's files owned by a Linux user with root permission.
We recommend that your make a user account specifically for Zenario, called siteadmin, if your environment allows you to.
To make a siteadmin user, do this:
sudo adduser siteadmin
We suggest you make a directory for one or more Zenario sites called clients, and then a specific one inside it for the first Zenario site.
sudo mkdir /var/www/clients
sudo mkdir /var/www/clients/zenariosite
Then make the owner be siteadmin:
sudo chown -R siteadmin:siteadmin /var/www/clients