Okay, made the edit and now get this error message.

PHP Code
UBB Error
We encountered a problem. The reason reported was

Script: /usr/www/users/iwrf/forums/libs/ubbthreads.inc.php
Line#: 2149
SQL Error: Incorrect key file for table './iwrf_ubbthreads/ubbt_CACHED_PERMISSIONS.MYI'; try to repair it
SQL Error #: 126
Query: select USER_ID,CACHED_PERMISSION_DATA from ubbt_CACHED_PERMISSIONS where USER_ID = '2'

Where to next?