Requirements problem

OK
Web servernginx/1.28.3
OK
PHP8.3.31
OK
PHP register globalsDisabled
OK
PHP extensionsEnabled
OK
Database supportEnabled
OK
PHP memory limit384M
OK
File systemWritable (public download method)
OK
Unicode libraryPHP Mbstring Extension
OK
Settings fileThe ./sites/default/settings.php file exists.
Error
Settings fileThe settings file is not writable.
The Drupal installer requires write permissions to ./sites/default/settings.php during the installation process. If you are unsure how to grant file permissions, consult the online handbook.
Check the error messages and proceed with the installation.