This is the language file that generates the success message at the end of a community builder registration. Simply edit the
DEFINE('_UE_REG_COMPLETE' entry to add
<META HTTP-EQUIV="Refresh" CONTENT="3; URL=http://www.yoursite.com">
to the copy. The
CONTENT parameter sets the length of time till the page directs.
/components/com_comprofiler/plugin/language/default_language/default_language.php