in addition to deleting the form element, you will need to delete the following code at line 32 -33:
$WAFV_Errors .= WAValidateEM((isset($_POST["Reset_Password_group_E_post"])?$_POST["Reset_Password_group_E_post"]:"") . "",true,1);
$WAFV_Errors .= WAValidateUnique("mydatabase_se",$mydatabase_se,$database_mydatabase_se,"member","MemberID","none,none,NULL","".((isset($_GET["fp_id"]))?$_GET["fp_id"]:"0") ."","MemberEmail","',none,''","".((isset($_POST["Reset_Password_group_E_post"]))?$_POST["Reset_Password_group_E_post"]:"") ."",true,2);