Open the url of your system in a browser. If you have just installed a new Fire system, your system will be deactivated. In that case click on the link control center.
If you want to open the control center of an already running system you need to log in as an administrator and press Control center.
When the control center has been opened, you need to enter the password you chose during the installation. If you have forgotten this password you can change it by logging in to fire.cs.chalmers.se and running fire-passwd.
If the system has not been deactivated you need to press Deactivate system before you can change any settings.
Don't forget to activate the system when you are done editing the settings!