This is an old revision of the document!
Just run the setup script as follow:
# /var/www/imscp/engine/setup/imscp-setup --reconfigure
If you want to specifically change something such as the main IP address for the control panel, you can use directly the ips flag and just answer the questions.
# /var/www/imscp/engine/setup/imscp-setup --reconfigure ips
This will cause all questions already seen to be show again.
You can type −−reconfigure help for more informations.