New headless install duplicati 2.0.2.21-1, how to access in remote web browser?

Sorry, but I don’t know how to do what you are asking.

Is this helpful? In /etc/systemd/system there are:
duplicati@.service
duplicati.service
All the lines in duplicati.service are commented out. Here is its contents:

#[Unit]
#Description=Duplicati web-server
#After=network.target

#[Service]
#EnvironmentFile=-/etc/default/duplicati
#ExecStart=/usr/bin/duplicati-server $DAEMON_OPTS

#[Install]
#WantedBy=multi-user.target

And here is duplicati@.service:

[Unit]
Description=Duplicati web-server
After=network.target

[Service]
User=%I
EnvironmentFile=-/etc/default/duplicati
ExecStart=/usr/bin/duplicati-server $DAEMON_OPTS

[Install]
WantedBy=multi-user.target

Can you give me some more specific help, please? Or, point me in the right direction.

Thanks,
Mark