Installled 3rd party script need help with php error code

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http://www.linuxquestions.org – I installed third party script on dedicated server from godaddy. this is an unassisted server and our tech guy is awol so I am trying to make it work. Very little help from 3rd party. I installed and think I have most issues corrected but when I run index.php I get the following error, "Fatal error: Call to undefined function mb_convert_encoding() in /home/realdeal/public_html/functions/include/function/utility.php on line 0". The "support" at the script provider sent me "Open php.ini and uncomment line "extension=php_mbstring.so" - Check your php extension d (HowTos)