[SuperFly]

ALTER TABLE xusergroup ADD hideawaypermissions INT( 10 ) UNSIGNED DEFAULT '0' NOT NULL

Edit x with your userbase data table, for instance mine is vb

open hideaway.php
Find

// Throw the whole mess in the database.
$db->query_write("INSERT INTO ".TABLE_PREFIX."usergroup (title,usertitle,showinlist,ispublicgroup) VALUES ('$title','$usertitle',$showinlist,$ispublicgroup)");

Replace with

// Throw the whole mess in the database.
$db->query_write("INSERT INTO ".TABLE_PREFIX."usergroup (title,usertitle,ispublicgroup) VALUES ('$title','$usertitle',$ispublicgroup)");