OCS-NG install error

OCS Inventory Installation

NOTICE: You will not be able to build any deployment package with size greater than 50M.
You must raise both post_max_size and upload_max_filesize in your php.ini to encrease this limit.

ERROR: can't write in directory (on dbconfig.inc.php), please set the required rights in order to install ocsinventory (you should remove the write mode after the installation is successfull)