There are many settings that you can adjust to configure and customize MantisBT. Refer to the Configuration section, as well as the config_defaults_inc.php file for in depth explanations of the available options. Check out also the Customizing MantisBT section for further options to personalize your installation.
This step is normally only required for new installations, but when upgrading you may want to review and possibly customize any new configuration options.
Open or create the file config_inc.php in an editor and add or modify any values as required. These will override the default values.
You may want to use the provided config_inc.php.sample file as a starting point.
WARNING: you should never edit the config_defaults_inc.php file directly, as it could cause issues with future upgrades.