How to change Vbulletin forum mysql db prefix?

Follow the following procedure:
– Backup your database and verify it is a complete backup
– Close your board
– goto:
– Follow the instructions
– When finished, edit your ./includes/config.php with the new prefix.
– Reopen board

Note: Do not alter the tableprefix value in config.php until this script has completed and you are given a message telling you to edit the value.