help me install OpenX problem

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SQL-Server

HTML

PHP

I install OpenX
http://www.openx.org/[^]
I tried on localhost no problem
after I upload to the web server error install


error
http://pcboxsearch.com/iklan/[^]
"Detected problem:
* The PHP "memory_limit" value is set to less than the required minimum of 128MB, but because the built in PHP function "ini_set" has been disabled, the memory limit cannot be automatically increased."


I ask the server profider
they told me to make php.ini
they do not explain what must be filled in the php.ini file
and where is the php.ini file uploads

Can you help me what should I fill in the php.ini file
and where I should uploads

I am a beginner still learning
please explain it