Installatie error

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Duidelijke omschrijving van het probleem:

Requirements Check
Requirements
PHP Version: 5.5.8
Supported DB Extensions: MySQL Improved, MySQL, SQLite 3
Supported Translation Extensions: Multi-Byte, iconv
PHP XML Extensions: Installed
Configuration File Writable: Writable
Settings File Writable: Not Writable
Cache Directory Writable: Writable
File Uploads Directory Writable: Writable
Avatar Uploads Directory Writable: Writable
Error
The MyBB Requirements check failed due to the reasons below. MyBB installation cannot continue because you did not meet the MyBB requirements. Please correct the errors below and try again:

The settings file (inc/settings.php) is not writable. Please adjust the chmod permissions to allow it to be written to.


Dit zegt hij als error bij install iemand een idee hoe ik dit fix?
Thx alvast