This is only a bad formulation of message. It's static message that you can see in
Open it if editor you like, e.g.:
- nano /var/www/html/index.html
Observe it and you will notice that message there.
If you change that file to:
Save it and exit, go to Droplet and you shall see Hello World!
For changing files you will need to SSH and you can learn more about it here.
DigitalOcean Droplets are managed using a terminal and SSH. SSH is an encrypted network protocol for remote server login and command execution. It is the standard method used for accessing and interacting with Linux servers.
This tutorial shows how to connect to a DigitalOcean Droplet for the first time by using the OpenSSH client.