rackons2015

Hi, When i install Revive Adserver, then after installing Some Php error shows as shown below : Error: timeout => The PHP function set_time_limit() has been disabled and max_execution_time is set to 20 which may cause problems with functionality such as maintenance badPhpConfiguration => Your current PHP configuration does not meet requirements of Revive Adserver. To resolve the problems, please modify settings in your 'php.ini' file. Please tell me whts the problem, how to solve it?? Where is php.ini file, i cant find it..