How to restart Ghost

Hi,

Based on these instructions from DO I am trying to restart Ghost (so the handlebar file changes shown) https://www.digitalocean.com/community/tutorials/how-to-configure-and-maintain-ghost-from-the-command-line

Step 1: logged into Console (via DO site)

Step 2: Tried at these directories cd /var/www/ghost/content/themes/ cd /var/www/ghost/ cd /var/www/

Step 3: Trying this command service ghost restart

also tried these

sudo service ghost stop sudo service ghost start

then tried these

sudo systemctl restart ghost sudo systemctl restart nginx

** getting this message Failed to restart ghost.service: Unit ghost.service not found.

I then read that “ghost” is not a service per the thread below but the commands in this article didn’t work either. https://www.digitalocean.com/community/questions/ghost-start-and-stop-ubuntu-service-command

I am new to this so any help would be appreciated.