Um... he couldn't get it installed, so there's no Manager
What I had in mind was to create a file named info.php, with this in it
Then upload that file to your setup folder, and in the browser address bar put
localhost/modx/setup/info.php
That will give you all kinds of information about your PHP, including paths to the default php.ini as well as to the php.ini being used (if there are any others).
It will also show the default date.timezone setting as well as the one actually being used.